How to use ClientID, Username, Password?

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Are you running into a rate limit problem?

Sending MQTT messages within rate limits

Cayenne MQTT messages are currently rate limited to 60 messages each minute. If your client code sends messages at a higher rate it will have messages dropped and if it continues to send messages above the limit can run the risk of being disconnected or blocked. In order to keep your client sending messages below the limits make sure you only send data at intervals. For embedded devices like Arduino this means you should not send data by just using a virtualWrite() call within the main loop(). …