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- Lots to look into here! Thank you! The modem is directly connected into the pi, no cable. I'll try to use some of your suggested tools and read your links today. I will have to play more with it after work. I appreciate the information!Shrout1– Shrout12019-05-17 11:29:25 +00:00Commented May 17, 2019 at 11:29
- @Shrout1 You are welcome. I suggest to also try USB/TTL cable, for easy swap testing, and also sooner or later you might need more than one UART channel. Good luck and have a nice weekend.tlfong01– tlfong012019-05-17 12:10:57 +00:00Commented May 17, 2019 at 12:10
- Worked it out! I was trying to poll the TTY too quickly and so I was looking for a response before the modem could actually query the network. Thanks again for your help!Shrout1– Shrout12019-05-17 18:24:16 +00:00Commented May 17, 2019 at 18:24
- How nice! I also learnt a lesson from your experiments. I am thinking of adding a user programmable delay in my UART loopback program, so the user can adjust the delays. You also remind me when I first played with a BlueTooth serial module. I did not realize in the beginning that the blue tooth modules needs some time (in the order of milliseconds) to process the data from Rpi. And after adding a wait-for-module-operation function, all problems disappeared! Have a nice weekend!tlfong01– tlfong012019-05-18 00:57:26 +00:00Commented May 18, 2019 at 0:57
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