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Subject: (MQTT-11) Length of client Identifier
The client ID length limit is one of the points that has come up frequently when people have been talking to me about MQTT. There is no intrinsic reason within the protocol to limit it to 23 characters. I would be keen on increasing the limit. I've carried out a survey of existing MQTT implementations Servers: mosquitto, activemq, rabbitmq, apollo, rsmb, mqtt.js Client libraries: libmosquitto, python-mosquitto, paho c, paho java, paho javascript, paho lua. Of these, only rabbitmq on the server side and paho java and javascript implement the 23 character client id limit. Even a minor increase in length to 32 bytes would be very helpful.
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