# GSM 2G gateway
## Receiving SMS from 2G

Subscribe to all the messages with mosquitto or open your MQTT client software:
`mosquitto_sub -t +/# -v`

Generate your SMS by sending an SMS to the phone number of the A6/A7 SIM card you will see :

```
home/OpenMQTTGateway/2GtoMQTT {"phone":"+33123456789","date":"2018/04/22,16:17:51+02","message":"Hello OpenMQTTGateway"}
```

## Send data by MQTT to send an SMS message with A6/7

`sudo mosquitto_pub -t home/OpenMQTTGateway/commands/MQTTto2G -m '{"phone":"+33123456789","date":"2018/04/22,16:17:51+02","message":"hello"}'`

This command will send by SMS the sentence "hello" and use the phone number 0123456789

Arduino IDE serial data received when publishing data by MQTT

![](../img/OpenMQTTGateway_serial_2G_1.jpg)

Arduino IDE serial data received when receiving SMS

![](../img/OpenMQTTGateway_serial_2G_2.jpg)