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URC interrupted by AT command result (MC55i) | Telit Cinterion IoT Developer Community

October 16, 2015 - 1:35pm, 2160 views


I'm using a MC55i module which has been modified by Triorail to support the GSMR frequencies. I use this module to receive diagnostic SMS from our trains.

My problem is that the URC +CMT (derect forwarding of incoming SMS) sometimes gets interrupted by the result of a previous transmitted AT command.

For example:

tx: AT
rx: +CMT: ,94

The 'OK' respons from the AT command is in the middle of the received PDU code. Also the AT echo of the command is missing?

I have echo turned on and wait 100ms after sending a command just like the datasheet describes but it's still interrupting the URC code.

I wonder if there is any way to prevent this from happening?