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We will use the 🌎release page of WIZ550S2E's in github.

  • v1.4.1 - Modbus Version

  • v1.3.0 - MQTT Version

    • Added features - MQTT
      • Source code -
      • AT+MQTTSET : (AT command) This command is used to initialize the necessary parameters of MQTT connection(set information automatically saved)
      • AT+MQTTCON : (AT command) Implement MQTT to connect the Broker
      • AT+MQTTPUB : (AT command) Publish the message to subscribed Client(set topic automatically saved)
      • AT+MQTTSUB : (AT command) Such topics will be pushed to the WIZ550S2E when received by the Broker(set topic automatically saved)


For more information about the changes for each version, please see Revision History. For all revision binary files including below, you can see at the release page of WIZ550S2E's in GitHub.

Firmware upload(TFTP) guide

Guide Document
  • Notice
    • a working gateway is needed
    • pc and module has to same subnet
    • WIZ550S2E must be done Factory reset, After a firmware update. (Factory reset pin Active Low > 5sec)

Guide Video

Source code

Configuration Tool


We will not upload files in here. We will use the release page of configuration's in github.

Please refer to below compatibility table and use appropriate version.

F/W VersionConfiguration Tool Version

Environment configuration

Source code