Tunnel – Remote management of up to 4 0-10V analog outputs via Telnet and/or MQTT/S.
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Scenario details:
- It is necessary to be able to change the state of 4 remote 0-10V analog outputs to dim some of the luminaires connected to them. Such remote activation must be done through telnet and/or an MQTT/S platform.
- For telnet access, only TCP connections from authorized IPs 1.2.3.4 and 1.2.3.5 must be allowed
Solution: MTX-Tunnel firmware + MTX-IoT-S [4-N] 
Configuration example (config.txt file) for the indicated scenario:
| Configuration | Observations |
| GPRS_apn: movistar.es GPRS_login: MOVISTAR GPRS_password: MOVISTAR GPRS_timeout: 0 MTX_pin: 0000 MTX_model: 199802407 MTX_mode: none MTX_ping: 30 MTX_pingIP: 8.8.8.8 MTX_numGSMErrors: 180 MTX_TPProtocol: ntp MTX_TPServer: ntp.roa.es MTX_TPServer2: es.pool.ntp.org MTX_TPFormat: unix FIREWALL_enabled: on FIREWALL_IP1: 1.2.3.4 FIREWALL_IP2: 1.2.3.5 TELNET_enabled: on TELNET_login: user TELNET_password: 1234 TELNET_port: 20023 MQTT_enabled: on MQTT_server: tcp://broker.mqttdashboard.com:1883 MQTT_id: [IMEI] MQTT_login: MQTT_password: MQTT_attopic1: [IMEI]/AT MQTT_atrtopic: [IMEI]/ATR MQTT_persistent: off MQTT_qos: 1 MQTT_keepalive: 60 |
GPRS APN provided by GSM operator GPRS Login GPRS Password Modem is permanently connected to GPRS PIN if it has one Device model No need for serial-IP tunnels Every 30 minutes PING check Google IP (f.e.) to ping Reset if no registry on GSM network in 1800 secs. Time synch protocol Time server Time server backup Unix time format All IPs are not authorized Authorized IP 1 Authorized IP 2 We activate the Telnet service Username Password TCP port MQTT service MQTT broker, format protocol://url:port Device ID in broker Username Password MTX topic to recieve AT commands Topic where MTX sends responses to AT commands No persistence QoS established Keepalive |
Details:
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MTX-IOT-S family modems have up to 4 0-10V analog outputs (DAC) (from DAC0 to DAC3)
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To remotely change the status of an analog output, it must be done by using an AT command sent remotely via Telnet and / or MQTT (it is also possible via SMS, modbus tcp, etc). The command to send is AT ^ MTXTUNNEL = SETDAC, X, Y where X indicates the DAC on which to act (0… 3) and Y indicates the value of the analog output (0… 10000) expressed in millivolts.
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To send the AT command to the modem via MQTT you must do it on the topic configured in MQTT_attopic1 Remember that if you configure something like [IMEI] / AT, the modem will replace that text [IMEI] with its real IMEI, that is, for example by something like 354033091777774 / AT. The modem will send the response to the command to the TOPIC specified in the MQTT_atropic parameter, which in the case of this example is [IMEI] / ATR
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Example of sending AT commands to remotely change the value of DAC0 to 6.5V from an MQTT broker
- Example of sending AT commands via telnet to change the value of the DAC2 analog output to 7.3V. Also example of querying the set value.
