Tunnel – Advanced Tunnel 4G-RS232. Set up the modem as a TCP/IP Server connected occasionally when a GPIO and ADC level changes
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Scenario details:
- There are several devices with an RS232 port and they need to be monitored from a Central PC via a Tunnel 4G-RS232
- We will very rarely need to access the RS232 devices, only when there is a special incoming SMS/missed call, when there is a change from “0” to “1” on a digital input or when the level of the Analog/Digital converter of the modem is below 500mV or above 1500mV
- Therefore, the 4G-RS232 Tunnel should be activated for 10 minutes when it receives a missed call or a special SMS with the word “on” from any phone number or when the trigger is met for the Analog/Digital input. If there is a call or SMS, the MTX Tunnel will return an SMS with the IP address from the GSM operator because SIM cards with a dynamic IP will be used. The modem must also send its current IP address, the GPIOs and ADCs readings to a server and to a Control Centre (to report the event)
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: on COMM_autorts: on COMM_stopbits: 1 COMM_parity: none GPRS_apn: movistar.es GPRS_login: MOVISTAR GPRS_password: MOVISTAR GPRS_DNS: 8.8.8.8 GPRS_timeout: 10 MTX_model: MTX-4G-JAVA-IOT-STD-N MTX_mode: server MTX_urc: off TCP_port: 20010 FIREWALL_enabled: off SMS_sendIP: on SMS_alPhones: on WAKEUP_gpioEnabled: on WAKEUP_gpioValue: 1 WAKEUP_adcEnabled: on WAKEUP_adcValueMin: 500 WAKEUP_adcValueMax: 1500 DNS_enabled: on DNS_server: 200.201.202.203 DNS_mode: socket DNS_password: 12345678 DNS_port: 20000 |
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 Google DNS. Must be used if TCP_IP is set to DNS Connected for 10 min if there’s no serial data traffic MTXTerminal modem model used TCP server mode URC messages will not be sent TCP port used Accepts incoming connections from any IP GPRS IP sent by SMS to mobile call or SMS text “on” All number phones are authorized 3G-RS232 active when GPIO input level changes Active when GPIO input level changes to “1” 3G-RS232 active by ACD1 3G-RS232 active when Analog input level below 500mV 3G-RS232 active when Analog input level above 1500mV Enables DNS service Server DNS IP address DNS communication socket type Password string sent in DNS communication DNS server port used |