Handshaking... Error Unexpected Response 0x68 [portable] -

stty -F /dev/ttyUSB0 115200 raw -echo cat /dev/ttyUSB0 | xxd -c 16

Next time you see 0x68 , don't panic. It's just a byte telling you exactly where the conversation broke down. handshaking... error unexpected response 0x68

If the basic troubleshooting steps do not resolve the issue, try the following: stty -F /dev/ttyUSB0 115200 raw -echo cat /dev/ttyUSB0