I have a TRB245 modem and am trying to send SMS using the RS232 and AT commands.
With both Full Control and Partial Control settings, the modem always writes the signal back to me, e.g. +QCSQ: "LTE",74,-101,158,-10. The problem is I have no flow control and this causes data collisions.
In partial control, the modem does not even respond to the AT command.
I need the Internet on the Ethernet interface and the ability to send and receive SMS via RS232 at the same time.
What options are there?