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I know I can communicate with GSM/CDMA modems using AT commands. However, as far as I know this doesn't work when connected - is there a way to read status information (signal strength, GSM/HSDPA mode etc) while connected?

I am not sure if modemmanager will produce the information, I tried it with Nokia phone and it didn't - however I would like it mostly for the Qualcomm chipset modems (Huawei), does anyone have any experience reading realtime signal information from these modems?

Matt Aldridge
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ondra
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2 Answers2

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As far as I am aware you can use AT+CSQ command to receiving the signal quality. This is independent of whether the modem is connected to an operator or not. My experiences have been with Wavecom, Siemens, and Sierra Wireless modems.

Request:

AT+CSQ=?

Response:

+CSQ: <rssi>,<ber>

Where <rssi> is received signal strength indication and <ber> is the bit error rate.

There is also the possibility of getting regular unsolicited updates but this is normally modem/manufacturer specific. For example Wavecom modems use AT+CCED, Siemens use AT^SMOND.

Matt Aldridge
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  • How do I communicate with the modem when it is connected? E.g. I use /dev/ttyACM0 to connect with ppp to the internet, so I cannot use the same device to send AT commands? – ondra Jan 09 '12 at 18:26
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    A lot of modems are capable of multiplexing. So one channel is for standard AT commands and then a dedicated channel for GPRS/UMTS communication. Is your modem capable of that? – Matt Aldridge Jan 09 '12 at 18:43
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Qualcomm provide some software tools can do this. Usually, I use QXDM to check the realtime status with Qualcomm chipset modems use USB cable.

EdisonWang
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