Question
“Dropped What does the error message "Dropped message: QoS 0 channel not writable” this error message is writable" signify when observed in the HiveMQ control center.?
Answer
This The "Dropped message: QoS 0 channel not writable" notification appearing in the HiveMQ Control Center is not indicative of a broker error. As per the MQTT specification, as QoS 0 messages , according to the MQTT specification, have no delivery guarantee and can may be dropped. The notification is displayed in the Control Center in order to notify about a possible issue with purpose of this notification is to alert users to potential concerns related to slow-consuming clients.
When your clients are consuming slowly or cannot handle the load on subscribed topics individually then a possible solution is to use shared subscriptions.
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