Use MQTT protocol to transmit data

Use MQTT protocol to transmit data#

Build Broker Server#

  • Use a server to build MQTT Broker, and the barcodes uploaded by the scanner are transferred through this server.

Demo software#

EMQX open source version, download address: EMQX

Testing Services#

../../media/wifi-emqx.png

Note

Server Connection Information

  • Host：mqtt.handy.pub

  • Port：1883

  • Username：netum

  • Password：netum@2022

    For testing use only and strictly prohibited for use in production environments.

Configure Scanner#

Configure WiFi and Broker#

   

Note

  • The scanner connects to the MQTT Broker using port 1883 by default.

  • The topic content subscribed by the scanner is the device ID.

Modify the MQTT connection port#

   

Modify the scanner publishing topic#

   

Modify the scanner subscription topic#

   

Receiving Data#

  • Use the MQTT client software [MQTTX] to connect to the Broker server and subscribe to the topic where the scanner publishes messages.

../../media/wifi-mqttx.png

Development Reference#

Contents