@JonB said:

Sorry, looking back at docs, the data needs to be a byte string. You passed an actual string.
self.peripheral.write_characteristic_value(c, 0xA00101A2.to_bytes(4, 'big'), False)

THIS WORKED!!!!! I cannot thank you enough.
Hope enough people find this thread because there were so many unanswered threads online.

This is the device I have:
https://www.amazon.com/dp/B07MKMFP6H/ref=cm_sw_r_tw_dp_46SC6RK392XTNVHDRE89
https://drive.google.com/file/d/1aUKZaKQnj6v4Jz-hOtDGEAVyBKMAJmQk/view?usp=sharing

Any insight on how to do that? Reading up and trying to learn....
My background is mostly Bash and Powershell scripting.

I need to write "A00101A2" to a BLE Relay and cannot figure out how. The following does not work.
self.peripheral.write_characteristic_value(c, '0xA00101A2', False)

Have no idea how to format "A00101A2" for the Pythonista core bluetooth module. I can use something like "nRF Connect" or "BLE Hero" to set the value and it works.

Executing self.peripheral.write_characteristic_value(c, '0xA00101A2', False) sets the value to something else thats not A00101A2