HMS NETWORKS CANbridge NT Lua ADK Bridge Router User Guide

C Funcons Called from Lua  

CAN@net NT/CANbridge NT Lua ADK  

• rx_port: CAN port where the messages are received (1..4)  

• tx_port: CAN port where the messages shall be sent (1..4)  

• turn_on: possible values: trueor false  

5.2.3. Module mqtt  

The module mqttis loaded by default and directly available.  

Funcon 'mqtt.publish'  

mqtt.publish(topic, payload, qos)  

Publishes (sends) an MQTT message to an MQTT broker. The broker setngs have to be specied in the device  

conguraon (MQTT Broker Setngs).  

• topic: message topic as string (maximum length is 256 characters)  

• payload: message data as string or array (maximum length is 1536 characters)  

• qos: quality of service (0, 1, 2)  

TIP  

If Lua is enabled in "remote mode", the maximum string length for topic and payload is 184 bytes  

each due to USB communicaon limiaons.  

Funcon 'mqtt.subscribe'  

mqtt.subscribe(handle, topic, qos)  

Sends a SUBSCRIBE message to the MQTT broker to be able to receive messages on topics of interest.  

• handle: user dened reference to the registered message, to be used inside on_mqtt  

• topic: message topic as string (maximum length is 256 characters)  

• qos: quality of service (0, 1, 2)  

TIP  

If Lua is enabled in "remote mode", the maximum string length for topic and payload is 184 bytes  

each due to USB communicaon limiaons.  

5.2.4. Module sys  

The module sysis loaded by default and directly available.  

Funcon 'device_info'  

Reads and provides device related inormaon as Lua table. Here a code extract:  

4.02.0332.20002 Version 1.5  

Page 13 of 20  

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