Embedded Linux - Get Signal Strength of Modem While Connected

Question

I am running a USB cell modem via PPP in Embedded Linux. I can use AT commands via minicom to connect to the modem and interrogate the signal strength (AT+CSQ) when the PPP connection is not active. However, when it's active, this is not possible.

Is there any way to retrieve the signal strength from a PPP connected USB cell modem while the PPP connection is being used? I am open to an API or any other method available.

Answer 1

What does the physical setup look like? 1. Are you using a modem that is on a board designed/printed by the same company as your SBC? 2. Is it connected via something like PC104 serial or USB? 3. What specific modem are you using?