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Scenario details:
- There are 3 RS232 devices configured as 9600, 8, N, 1 and no flow control. We need to control and monitor from a central server using the 3G-Serial tunnel gateway
- You need to access them occasionally with a remote control, so the modem connected to the remote devices does not need to be permanently connected to the 4G
- The modem will connect to the 4G for 10 minutes, but only after receiving a missed call or an SMS with the text string “on” from any phone number. The modem responds to same phone number with an SMS detailing the IP address obtained from the network
- Then, the modem will connect to the 4G waiting for an input connection request in TCP port number 20010
- We will use a dynamic IP address with network operator SIM cards.
- For more security, modems will only respond to incoming missed calls or special SMSs from authorized phones. Another security feature is that MTX-Tunnel’s modem will only accept an incoming connection from a specific IP address. For example in this case: 200.101.102.103
Solution: MTX-Tunnel firmware + MTX-Java-IoT/MTX-Java-T/MTX-Java-T2
Config.txt configuration file:
| Configuration | Observations |
| COMM_baudrate: 9600 COMM_bitsperchar: 8 COMM_autocts: off COMM_autorts: off COMM_stopbits: 1 COMM_parity: none GPRS_apn: movistar.es GPRS_login: MOVISTAR GPRS_password: MOVISTAR GPRS_timeout: 10 MTX_PIN: 0000 MTX_model: MTX-IOT-4G MTX_mode: server MTX_urc: off TCP_port: 20010 FIREWALL_enabled: on FIREWALL_IP1: 200.101.102.103 SMS_allPhones: off SMS_sendIP: on SMS_validPhone1: +34666123456SMS_dafaultPrefix: +34 SMS_validPhone2: +34666123457 SMS_dafaultPrefix: +34 |
Serial port baud rate |
Details:
- GPRS_timeout: 10” This parameter makes the 3G connection activate itself after the missed call or incoming SMS with “on” text string but stop after10 minutes without 4G-serial data traffic
- As an example, if the data is transferred in 30 minutes then the connection will be closed after another 10 minutes, giving a total of 40 minutes
Enter the “ethernet” or “modem” connection type:
For an ethernet configuration, make sure the IP parameters are compatible with server access according to the concentrator local network configuration. For an ethernet connection, the configuration must be compatible with the concentrator’s local network topology so that it can access the servers. This configuration is done from the “Networks” configuration page (see section 3.2.2.3: “Networks”).
For a modem connection, the modem configuration must be correct before a connection can be set up. This configuration is done from the “Modem” configuration page (see section 3.2.2.4: “Modem”).
The parameters for the servers to be configured are at least the following:
Therefore the following fields need to be configured: “Interface”, “Type”, “Server type”, “Address”, “Port”, “Login” and “Password”.
The other fields can be left at the default values subject to the directories having been properly created beforehand. See section 3.1.2: “Configuration files” for more details.
Wait. The concentrator will reboot using its factory configuration.
Esperar. El concentrador arrancará con su configuración de fábrica.
Warten Sie. Der Hub startet nach ein paar Augenblicken mit der Werkseinstellung neu.
Attendre. Le concentrateur va redémarrer avec sa configuration usine.
