Tunnel – MTXTunnel configured as TCP/IP client and connected permanently to LTE/4G. Network operator dynamic IP addresses are used
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Scenario details:
- There are 3 RS232 remote devices, configured as a 9600, 8, N, 1 and no flow control. We need to control and monitor from a central server –PC with internet connection
- You need to access them occasionally with a remote control. Therefore the modem connected to remote devices does not need to be permanently connected to the 4G. The modem will only connect to the 4G when it receives a missed call or an SMS with the text string “on” from any phone number. Then, the modem will connect to the 3G waiting for an input connection request in TCP port number 20010
- We will use dynamic 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: 9600 |
Serial port baud rate 8 bit data CTS hardware control disabled RTS hardware control disabled 1 stop bit No parity GPRS APN from your network operator GPRS Login GPRS Password Connected 10 min if there’s no serial data traffic If SIM card doesn’t have PIN security, use 0000 MTX-Terminal modem model used TCP server mode URC messages will be not output TCP port used Firewall disabled: Any incoming connection is allowed All phone numbers are authorized IP sent to phone which made a call or “on” text SMS |
Details:
- “GPRS_timeout: 10” makes the 2G/3G/4G connection activate itself after the missed call or incoming SMS with “on” text string but stop after 10 min. without GPRS/3G/4G 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.