BG95-M3 modem ignoring ATE0 (echo off) command

IoT Modules LPWA Module
1

Hello everyone,

I’ve encountered unexpected behavior with the BG95-M3 modem: it seems to ignore the ATE0 command meant to disable echo. Below are the communication traces I’ve recorded:

RxGsm: RDY

TxGsm: ATE0
RxGsm: ATE0
RxGsm: OK

TxGsm: AT
RxGsm: AT
RxGsm: OK

TxGsm: AT+CMEE=1
RxGsm: AT+CMEE=1
RxGsm: OK

Has anyone experienced this issue or have any ideas on how to resolve it?
Any help or suggestions would be greatly appreciated.

Thank you in advance!

2

I think you can send the
ATE1 and show the log again.
As I guess, the uart tool you are using echo the AT command. It might not the ATE0 not working.

3

Thanks Bean.Wang-Q. Those traces are not from any UART tool but from my own firmware. With this same firmware but other unit of BG95-M3 the behaviour is as expected: echo is turned off.
So, most BG95-M3 work just fine regarding the echo off command, but for some reason some units do not.

4

Do you mean that some BG95-M3 works but some do not ?

Maybe you can try the BG95-M3 with another tool such as the QCOM on Windows.

5

If only some units are faulty could it be that there’s a solder joint between TX and RX pins? I’d check the soldering.

6

As you mentioned actually some AT command is working so the Hardware should be OK.
It is recommended to test with other tools