6 Software
User Manual 47/374
6.4.1 GSM
The default setup of the GSM modem provides functionalities to handle more than one GSM service at a time.
High Level Hardware Access
This shell script starts or stops the GSM modem and loads
APN settings automatically from database /etc/apns-conf-
xml depending of the /etc/init.d/rc.conf settings. Make sure
before start that a SIM-Card is inserted. Script is started
automatically by the boot up sequence.
p1: defines what action should be done
< start >
switches the modem on, set the SIM-PIN if
necessary, create MUX devices and start APN
detection
< stop >
switches the modem off
< restart >
calls stop
calls start
Interface at rc.conf: Set GSM parameters
Set the GSM parameters to etc/init.d/rc.conf:
# GSM baudrate
# Supported bit rates see table below.
export GSM_BAUDRATE="460800"
# PIN for the SIM card
export GSM_PIN=""
Example: Use picocom for GSM modem communication (AT commands)
The picocom binary was designed to serve as a simple, manual, modem configuration, testing and debugging
tool.
# picocom -b 460800 /dev/mux0
The key combination to execute picocom is CTRL+A+Q.
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