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+--- Thread: problem with 4g modem (/showthread.php?tid=3839)
RE: problem with 4g modem - EjvindHald - 29.09.2025
I have been trying it over the weekend, and it is only working now and then. Sometimes I can leave it for 1 hour, and then it can process a single new message - sometimes a few messages. If I enable the log writing, then it usually works, but that is not a long term solution.
This morning I got a reply after 7 minutes on a read request. This happens sometimes - sometimes no reply at all.
Hope you have some good ideas. The hardware is LM5p2-RIO3LTE.
RE: problem with 4g modem - admin - 29.09.2025
Logging does not affect how the script works. Try checking the signal quality periodically, maybe the modem loses connection: https://forum.logicmachine.net/showthread.php?tid=5369&pid=34692#pid34692
You can modify the logging part to skip timeout errors:
Code:
local res, err, cmd, pos, sms
res, err = self:read()
if err ~= 'timeout` then
log(res, err)
endRE: problem with 4g modem - EjvindHald - 29.09.2025
Here is the signal strength, which I things looks good. My antenna is located quite high which explains the good signal quality.
The change in the logging to filter out timeout is actually very good. When I send a SMS request with no response, there is no activity in neither Logs nor Alerts tab. However, if I do a LM reboot it picks up the previous message and does a proper respond.
If you can't figure it out, I will live with it. After all, the sendsms function is by far the most important, and that works flawlessly.
RE: problem with 4g modem - admin - 01.10.2025
Signal quality is good.
Looks like the issue is in the modem and/or SIM card. When LM boots the modem is power cycled. When the script starts it deletes all previously received SMS messages. If you say that sent messages are processed after a reboot it means that these messages weren't received previously otherwise they would have been deleted.