Can no longer send SMS via TRB140

[mmartin]

I have a TRB140 with which I have successfully sent SMS messages via the web UI and API for several days.
Today, it no longer works after an invalid JSON was transmitted.
Several restarts did not help. I also tried disconnecting the power.
Receiving messages works!
In the web UI, it takes a very long time before “Failed to send message” appears.
I can log in via the API and get a token, but it gets stuck when sending.

CLI Test:

Device:     TRB140
Kernel:     5.4.295
Firmware:   TRB1_R_00.07.18.3
Build:      ec1ef51550e
Build date: 2025-10-28 08:10:55

root@xxx-checkmk-lte1:\~# time gsmctl -D -S -s “00491511xxxxx TEST1”
GSMCTL modem\[0\]: Debug mode enabled
GSMCTL Modem id: 0
GSMCTL modem\[0\]: Calling Send SMS
GSMCTL modem\[0\] SMS: Checking input format
GSMCTL modem\[0\] SMS: Calling LGSM SEND SMS
\[gsmctl_send_sms:22\] error: ERROR: Failed to parse response
real    2m 15.51s
user    0m 0.00s
sys     0m 0.00s

I don’t see any messages with readlog. From the API, I only see the successful login.

The problem is as follows:
Not possible to send SMS by TRB140 (receive SMS possible) - Networking Solutions - Teltonika Community

Any idea where is the problem?

[Justinas]

Greetings,

Could you please clarify what you mean by “an invalid JSON was transmitted”?

Could you also check whether the SIM card is able to send SMS messages when inserted into a different device, such as a mobile phone?

Best Regards,
Justinas

[mmartin]

Hello Justinas,
Thank you for your feedback.
It was due to the SIM card or the provider’s limit!
Unfortunately, no information was provided by the provider Lyca Mobile.
Thank you for your support.