Module has to send via AT commands some system telemetry using REST (mostly via POST methods) protocol.
After some hours (between 16-20h) module stop writing back any information over TXD pin.
To test modem status, I tried to plug in to the PC using the USB. All COM ports are created correctly but computer didn’t receive any answer when commands like AT or ATI are sent.
Could it be a internal memory leak?
Firmware Revision: EC21EFAR06A02M4G
Could you please send me back if there is any FW update?
Hi Witt
Sadly it happens again after FW update, EC21 stop writing data on the Tx UART port. I’d check that host microcontroller continues sending data and it arrives to RX pin to modem. Quectel USB AT Port get froze too (deployed but no answers from it).
Signals levels with and without the error are (measured on modem pads):
I’m going to test the two firmwares during this 2 days.
Does EC21 have any command to monitor memory consumption?
Could a little power supply voltage drop cause that EC21 microcontroller get freeze but USB component (I don’t know if it works in a separate chip) continue working?