Tunnel – Basic LTE/4G/3G-Serial tunnel. MTX-Tunnel is configured as a TCP/IP server and permanently connected to Internet using a SIM provided by the operator with a fixed IP address
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Scenario details:
- There are 3 RS232 remote devices, configured as 115200, 8, N, 1 and hardware flow control. We need to control and monitor from a central server –PC with internet connection .
- You can access them at any time. Therefore, the modem connected to the remote devices must be permanently connected to GPRS. So the modem is configured as a server waiting for an input connection request in TCP port number 20010
- We will use fixed IP address network operator SIM cards
Solution: MTX-Tunnel firmware + MTX-Java-IoT/MTX-Java-T/MTX-Java-T2
Config.txt configuration file:
| Configuration | Observations |
| COMM_baudrate: 115200 COMM_bitsperchar: 8 COMM_autocts: on COMM_autorts: on COMM_stopbits: 1 COMM_parity: none GPRS_apn: internetestatico.movistar.es GPRS_login: MOVISTAR GPRS_password: MOVISTAR GPRS_timeout: 0 MTX_PIN: 0000 MTX_model: MTX-IOT-2G MTX_mode: server MTX_urc: off TCP_port: 20010 FIREWALL_enabled: off |
Serial port baud rate 8 bit data CTS hardware control enabled RTS hardware control enabled 1 stop bit No parity GPRS APN from your network operator GPRS Login GPRS Password Value 0 means MTX-Tunnel is always GPRS connected If SIM card doesn’t have PIN security, use 0000 MTX-Terminal modem model used TCP server mode We do not need the URC information messages TCP port used Firewall disabled: Any incoming connection is allowed |