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Hi, i got a some questions concerning TRB 140.

Up to present, for many years, we have been using a specific custom made protocol that transmits digital input changes from gprs modem to a data gateway, which in turn converts the data to  certain IEC protocol for SCADA. We have made the software in C and it runs natively in the modem device. Now, the current modem family has reached its EOL and we need a replacement for it. TRB140 would suit really well into this picture, but i really need to have a decent interface description upon how to handle modem functionalities and read/write the GPIO from from C-code. Also, i will need to have some kind of configuration interface for our own SW, but i think .ini file would be a decent solution for that. I checked the SDK instructions link from a response to another related comment, but there was just an empty page?

Actually, we do also have some other plans in the future, so in case we succeed with this case, there might be also other projects following with other TRB versions ( i.e. serial port use).

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Explanation for TRB network interfaces:

rndis0 - USB network tethering
rmnet0 - Mobile interface
rmnet_dataX - inherited from rmnet0, 8 interfaces because 8 contexts are used. Required for multi APN functionality.