Has anyone else experienced the SARA R410 locking up under low signal conditions when connected to AT&T? Usually when I see it happen, it goes like this:
- Open a TCP socket and send some data
- Close the socket, modem replies “OK”
- The next time I am ready to send some data, the modem is totally unresponsive to the AT terminal.
I am using all of the recommended response timeouts listed in the AT Manual and all PSM (power save mode) is disabled.
The only way to recover is a hard reset using the reset pin on the modem.
I have been battling this for a while. Using a higher gain antenna seemed to help, but I am still dealing with this. Resetting the modem within the program is no problem, I am just worried about long term damage to the modem. Sometimes 10+ resets are required per day.