Operating system name and version: Raspberry Pi reference 2020-05-27
Version of smsd: 3.1.21
Smsd installed from package repository
Name and model of a modem / phone: Wavecom
Interface: serial

Hi,

I have seven Wavecom modems connected to a raspberry Pi Zero with cheap Chinese serial to converters and they all have the same serial number. Problem is that now one can never be sure which SIM is on which Linux device.

My application is kind of upside down because it is based on the MSISDNs and I would rather decide which MSISDN the message is sent from as opposed to the the network it will be going to.

Is this possible regardless of the retarded serial to USB adapters?

Thank you

Thank you for the interesting question.

Actually, there is an undocumented feature which may help. An identity can be defined for each device, and it is checked when smsd starts. If a modem is using different port than what was defined, modem processes are swapped as required.

To use this feature, first all PIN's must be disabled. Also, if you have paths for example /dev/ttyUSB0 ... 6, your system must create the same paths even when the modems are in the different places.

Start the smsd with loglevel = 7, and collect IMSI codes for each device (SIM). If the IMSI gives an ERROR for all devices, collect IMEI codes.

Then add a line identity = <IMSI> for each device.

That's it. Here is an example configuration, which also uses MSISDN's as device names and in queue definitions:



Hope this helps.