Tunnel – Alarms sent by SMS and MQTT message before detection of 220V power loss and before the return of power. Modem with supercap of 1 minute of autonomy
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Scenario details:
- A modem is required to make a transparent IP-RS232 gateway to read a meter. It is also necessary that the modem can inform in case of a power failure, therefore the modem must have enough autonomy to send an alarm when the event occurs
- For this, a modem with supercap will be used, which will give it an autonomy of approximately 1 minute. This modem must send an SMS alert to a phone number when a 220V power failure is detected. It must do the same when it detects that the power has recovered
- In addition, the modem will send an alert message via MQTT to a control platform
Solution: MTX-Tunnel firmware + MTX-Java-IoT/MTX-Java-T/MTX-Java-T2 
EXAMPLE of configuration (config.txt file) for the indicated scenario. Solution for quick communication via Socket TCP:
| Configuration | Observations |
|
COMM_baudrate: 9600 |
Serial port baud rate 8 bit data No flow control No flow control 1 stop bit No parity APN GPRS provided by the GSM operator GPRS Login GPRS Password Permanent 3G session The SIM card PIN (if there is any) RS232 IP gateway in server mode MTX modem model being used Send SMS with commands from any phone Modem won’t respond IP to a missed call/SMS Commands can be sent to the MTX by SMS MTX responds with an SMS to a command SMS Saves the alarm to be sent by MQTT Logger will send alarm by MQTT MQTT topic where the alarm will be sent MQTT service enabled in the modem Broker IP/DNS, including port Identifier Topic to which subscribes to receive commands Topic where it sends the responses to commands Service quality 300 seconds Not necessary Power failure alarm enabled Refresh feed alarm text Text alarm SMS for power failure Alarm sending telephone |
Details:
- The model of modem used has an internal supercap that allows it to have an autonomy of approximately 1 minute once it loses power
- When you try to reset the modem (removing the power supply) remember to wait 1 minute for the reset to occur. Remember that you can also reset the modem by sending the command AT + CFUN = 1,1
- The MQTT message the modem will send when an alarm occurs due to lack of power will have this format:
{“IMEI”: 357299070187619, “TS”: “03/30/04 12:55:50”, “TYPE”: “POWER”, “APOW”: 1}
- The MQTT message the modem will send when the power is restored will have this format:
{“IMEI”: 357299070187619, “TS”: “03/30/04 12:58:32”, “TYPE”: “POWER”, “APOW”: 0}
Where: IMEI: is the unique identifier of the modem TS: it is the time stamp of when the event occurred TYPE: indicates the type of data frame. POWER indicates power alarm APOW: 1 = active power alarm. 0 = power alarm deactivates