You may need to print just the character code 1, not the string 0x01.
0x01
Try: Serial1.print("\x01"); instead of Serial1.println("0x01");
Serial1.print("\x01");
Serial1.println("0x01");
@Gordon started
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You may need to print just the character code 1, not the string
0x01
.Try:
Serial1.print("\x01");
instead ofSerial1.println("0x01");