Mqtt keep alive forever. Network traffic optimization Keep-alive inte...
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Mqtt keep alive forever. Network traffic optimization Keep-alive interval MQTT libraries generally use the keep-alive-interval to generate a periodic PING telling the server the client is still alive. The connect function can be called with 4 parameters as shown below : Jun 17, 2014 · Keep alive is needed to keep the connection alive, however there are some other options where you don’t really need keepalive. Right now the client gets orphaned if there is no activity between client and broker for about 5 minutes. In IoT Note The MQTT protocol does not use the TCP's built-in keep-alive mechanism as it is inflexible and limited in that it can be configured solely at the operating system level. The default time a connection must be idle before sending the first keep-alive packet is typically set to 2 hours, exceeding the tolerances of most MQTT applications. Developers can use this feature to ensure the stability of MQTT connections. Now I'm trying to figure out the reason for it for some time, and this is the reason I decided to share: When to use Keep Alive The Keep Alive feature functions much like a check-in system where one party regularly confirms their presence to prevent others from assuming something has gone wrong. Feb 9, 2026 · Keep Alive is a feature of the MQTT protocol that allows an MQTT client to maintain its connection with a broker by sending regular control packets called PINGREQ to the broker. Note The MQTT protocol does not use the TCP's built-in keep-alive mechanism as it is inflexible and limited in that it can be configured solely at the operating system level. The second Availabiliy state goes to offline it updates back to online.
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