Teltonika devices are simply gateways to transmit SMS messages in regards to SMPP implementation. It does not support receive or transceiver modes. It is based on v3.4 specification and should not have any compatibility issues.
It would be helpful if you could provide more details related to your setup such as device configuration, firmware, SMPP client software used, possibly a troubleshoot a file. However, for more details to be present in the logs, you need to connect to the router via SSH and enter the following commands:
- uci set smpp.smpp.llevel=0
- uci commit
- /etc/init.d/smpp restart.