From: Renat Zaripov <[email protected]>

Adding a short description for usage of SIM900 plugin.

Signed-off-by: Renat Zaripov <[email protected]>
---
 doc/sim900-modem.txt |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
 create mode 100644 doc/sim900-modem.txt

diff --git a/doc/sim900-modem.txt b/doc/sim900-modem.txt
new file mode 100644
index 0000000..2369338
--- /dev/null
+++ b/doc/sim900-modem.txt
@@ -0,0 +1,13 @@
+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/gsmtty3 provided by N_GSM mux.
+
-- 
1.7.7.3

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