Support mqttv3.1 WebSocket subprotocol in addition to mqtt (backport #15008) (backport #15009)#15010
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michaelklishin merged 1 commit intov4.1.xfrom Nov 25, 2025
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Addresses #15001 The Web MQTT handler only accepts the `mqtt` WebSocket subprotocol, rejecting clients that request `mqttv3.1`. This prevents some MQTT clients from establishing WebSocket connections. This change updates the protocol negotiation to accept either `mqtt` or `mqttv3.1` subprotocols. The handler uses `lists:search/2` to find the first matching protocol and echoes that exact value back in the `sec-websocket-protocol` response header, ensuring proper protocol negotiation with the client. (cherry picked from commit 12a6645) (cherry picked from commit 89df4a2)
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Addresses #15001
The Web MQTT handler only accepts the
mqttWebSocket subprotocol, rejecting clients that requestmqttv3.1. This prevents some MQTT clients from establishing WebSocket connections.This change updates the protocol negotiation to accept either
mqttormqttv3.1subprotocols. The handler useslists:search/2to find the first matching protocol and echoes that exact value back in thesec-websocket-protocolresponse header, ensuring proper protocol negotiation with the client.This is an automatic backport of pull request #15008 done by Mergify.
This is an automatic backport of pull request #15009 done by Mergify.