Tunnel – A basic example for meter reading with simultaneous GPRS connections and GSM calls
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Scenario details:
- The intention is to take electrical meter readings periodically, every 10 minutes. By obtaining readings so frequently you will access the meter via GPRS instead of with GSM calls in order to save costs
- At the same time, the energy operator (Endesa, Iberdrola, etc.) will obtain a reading once a day with a conventional GSM call
- The GSM call will have priority. When the modem receives a call from the operator it will “freeze” GPRS connections to allow the operator to obtain readings. Once the GSM call has ended, GPRS connections are re-established
Config.txt configuration file:
| Configuration | Observations |
| COMM_baudrate: 9600 COMM_bitsperchar: 8 COMM_autorts: off COMM_autocts: off COMM_stopbits: 1 COMM_parity: none GPRS_apn: movistar.es GPRS_login: MOVISTAR GPRS_password: MOVISTAR GPRS_timeout: 0 MTX_mode: server MTX_model: 199801421 MTX_ping: 35 MTX_pingIP: 8.8.8.8 MTX_radioBand: europe TCP_port: 20010 Firewall_enabled: off CSD_enabled: on |
Serial port baud rate Number of bits No flow control No flow control 1 stop bit No parity APN GPRS from the network operator GPRS Login GPRS Password Modem is always GPRS connected MTX server mode MTX terminal model Ping every 35 minutes without comms IP address to ping If modem is installed in Europe Establish GPRS Gateway, read the energy meter Accept incoming connections from any IP Accepts GSM calls from energy operator |