serial commands

diff --git a/docs/serial-commands.txt b/docs/serial-commands.txt
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+Commands can be issued using 3.3v serial on rx/tx pins
+
+# switch to debug mode
+
+*DEBUG
+
+# switch to admin mode
+
+*ADMIN
+
+direct connection with gsm modem
+
+ati
+ToL620:ati
+
+LYNQ
+LYNQ-L620G
+L620G_v01_01b09
+L620G_V3
+
+OK
+
+## read apn settings
+
+AT*MCGDEFCONT?
+ToL620:AT*MCGDEFCONT?
+
+*MCGDEFCONT: "IPV4V6","internet"
+
+OK
+
+
+## read SIM card number
+
+AT*MICCID
+ToL620:AT*MICCID
+
++CME ERROR: SIM not inserted
+
+?? hm. we do have sim card inserted!
+
+## read device IMEI
+
+AT+CGSN=1
+ToL620:AT+CGSN=1
+
++CGSN: 864823045031648
+
+OK
+
+## check if device is connected
+
+AT+CREG?
+ToL620:AT+CREG?
+
++CREG: 0,0
+
+OK
+
+## read current NB network band
+
+AT*MBAND?
+ToL620:AT*MBAND?
+
+OK
+
+
+# other commands from firmware
+
+*ANGLE
+x:+0.161 y:+0.390 x:-0000711 y:-0001718
+
+
+*INFORAMTION
+NUM:1 Idel
+NUM:2 Idel
+NUM:3 Idel
+
+
+*PWROFF
+L620 power off
+
+
+*PWRON
+ToL620:ATE0
+L620 power on
+
+*MATREADY: 1
+
++CFUN: 1
+
++ISOFTSIM:0,ready
+
+
+# back to debug mode
+
+*DEBUG
+
+# go back to sleep
+
+*SLEEP
+