Tunnel – Using API to switch a relay from a third-party or end user webpage

Scenario details:

• We want to program a web page and switch 1 relay, to switch a lamp on/off. For that we will use MTX-4G-JAVA-IOT-STD-RL with internal relay
• An end user will open the web page and will switch the external lamps on/off with the click of a mouse. MTX-Tunnel has to communicate the webpage data with modem’s GPIOs

Solution: MTX-Tunnel firmware + MTX-Java-IoT

Config.txt configuration file:

Configuration	Observations
GPRS_apn: movistar.es GPRS_login: MOVISTAR GPRS_password: MOVISTAR GPRS_timeout: 0 MTX_model: MTX-4G-JAVA-IOT-STD-RL MTX_ping: 30 MTX_pingIP: 8.8.8.8 WEBSERVER_firewall: off WEBSERVER_enabled: on WEBSERVER_login:user WEBSERVER_password: 1234 WEBSERVER_skin: http://www.mtxtunnel.com/webserverimg/ WEBSERVER_gsmScript: http://www.blogelectronica.com/gps/gsm.php	GPRS APN from your network operator GPRS Login GPRS Password Modem is permanently connected to GPRS MTX-Terminal modem model used Minutes for connectivity supervision ping Connectivity supervision IP address Firewall disabled Internal webserver enabled Webserver login Webserver password Webserver skin Script GSM positioning

HTML web page example code:

We will switch the relay. We will not show the initial relay state to simplify the example.

The web page aspect is shown in the following picture. Only this simple HTML code translates the link in an AT command to be sent remotely. The AT command changes GPIO output level.

Source code:

Details:

• The address 176.80.120.20 shown in the example is the MTX SIM IP. If you don’t have a SIM with a fixed IP you can check the parameters and examples DYNDNS_ on this guide
• To switch the MTX-4G-JAVA-IOT-STD-RL relay is necessary to act on GPIO6, like in the E/S tables of the different models, that can be found on this guide