Hi @Daniel Fedai Larsen Greetings! Welcome to Microsoft Q&A forum. Thank you for posting this question here. I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to accept the answer .
Modem doesn't respond to the first message, and the PPP driver is stuck in the
LPUART_WriteBlocking takes in a pointer to the data, not a single byte, so it should be:
void ppp_byte_send(UCHAR byte)
LPUART_WriteBlocking(MODEM_REG_BASE, &byte, 1);
If I missed anything please let me know and I'd be happy to add it to my answer, or feel free to comment below with any additional information.
I hope this helps!
If you have any other questions, please let me know. Thank you again for your time and patience throughout this issue.