With OTA working, I’m now moving on to the SIMCOM driver. For those of you trying to get it working, here are some starting points: You can toggle modem power on/off with: OVMS > egpio output 0 0 OVMS > egpio output 0 1 OVMS > egpio output 0 0 You can talk to the modem with: OVMS > power simcom on I (16814) uart: queue free spaces: 10 OVMS > egpio output 3 0 OVMS > simcom tx AT SIMCOM rx 41 54 0d 0d 0a 4f 4b 0d 0a AT...OK.. OVMS > simcom tx AT+CGMI SIMCOM rx 41 54 2b 43 47 4d 49 0d AT+CGMI. SIMCOM rx 0d 0a 53 49 4d 43 4f 4d 20 49 4e 43 4f 52 50 4f ..SIMCOM INCORPO SIMCOM rx 52 41 54 45 44 0d 0a 0d 0a 4f 4b 0d 0a RATED....OK.. OVMS > simcom tx AT+CGMM SIMCOM rx 41 54 2b 43 47 4d 4d 0d AT+CGMM. SIMCOM rx 0d 0a 53 49 4d 43 4f 4d 5f 53 49 4d 35 33 36 30 ..SIMCOM_SIM5360 SIMCOM rx 45 0d 0a 0d 0a 4f 4b 0d 0a E....OK.. OVMS > simcom tx AT+CGMR SIMCOM rx 41 54 2b 43 47 4d 52 0d AT+CGMR. SIMCOM rx 0d 0a 2b 43 47 4d 52 3a 20 33 35 33 31 36 42 31 ..+CGMR: 35316B1 SIMCOM rx 31 53 49 4d 35 33 36 30 45 0d 0a 0d 0a 4f 4b 0d 1SIM5360E....OK. OVMS > simcom tx AT+CGSN SIMCOM rx 41 54 2b 43 47 53 4e 0d AT+CGSN. SIMCOM rx 0d 0a 38 36 33 37 38 ... SIMCOM rx 34 0d 0a 0d 0a 4f 4b 0d 0a 4....OK.. OVMS > simcom tx AT+CIMI SIMCOM rx 41 54 2b 43 49 4d 49 0d AT+CIMI. SIMCOM rx 0d 0a 32 33 34 35 ... SIMCOM rx 31 0d 0a 0d 0a 4f 4b 0d 0a 1....OK.. OVMS > simcom tx AT+CICCID SIMCOM rx 41 54 2b 43 49 43 43 49 44 0d AT+CICCID. SIMCOM rx 0d 0a 2b 49 43 43 49 44 ... SIMCOM rx 0a 4f 4b 0d 0a .OK.. (note that the 'egpio output 3 0’ is needed at the moment, to set DTR and wake up the modem, you can also ‘egpio output 3 1’ to make it sleep) Regards, Mark.