334620f36e
Fixes: #9597 Issue link: https://github.com/spring-projects/spring-integration/issues/9597 When input channel for the endpoint with a `Mqttv5PahoMessageHandler` is an `ExecutorChannel` and a lot of concurrent messages are sent, the `Connect already in progress (32110)` exception can be thrown * Wrap `this.mqttClient.connect()` in the `Mqttv5PahoMessageHandler.publish()` into a `Lock` **Auto-cherry-pick to `6.3.x` & `6.2.x`**