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SIM900 modem usage
===================
To enable SIM900 module support you need to put the following
udev rule into appropriate file in /{etc,lib}/udev/rules.d:
KERNEL=="gsmtty3", ENV{OFONO_DRIVER}="sim900"
On the i-Tetra tracking device, the SIM900 is accessed
via N_GSM mux device. We use ofono as SMS message
service and incoming voice calls service, so we
use /dev/gsmtty1 provided by N_GSM mux.
SIM800 modem usage
==================
When using sim800 modem, the udev rule is the same as the
sim900 rule :
KERNEL=="ttyS3", ENV{OFONO_DRIVER}="sim900"
Because the SIM800 and SIM900 code are the merged into one driver.
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