Welcome to the MQTT mailing list and discussion group.

MQTT is a lightweight publish/subscribe messaging protocol originally developed for sensor applications. MQTT is extremely useful and widely adopted in mobile environments due to the low power consumption, simplicity of API, and small bandwidth used. Clients and servers are available in various languages including C, Python, Erlang, C#, Java etc - see for more information about the protocol and the community around it.

This group is intended to bring together discussions of the protocol and different implementations. Other discussion media exist (for example, individual software implementations may have their own project resources) but this group is for discussion of the protocol and MQTT ecosystem as a whole. Off-topic debates, discussion around alternative protocols, etc. do not belong in this group. Thanks.

Initial posts will need to be moderated by a group administrator before they appear to the community.

Showing 1-20 of 887 topics
Problems connecting to port 8883 with arduino Dan Hoover 1:17 PM
Why constrain multi-level wildcard '#' to the end? And why only one? Eric Tsai 7/25/17
mycustom library and pubsubclient call back Waqas Ahmed 7/24/17
Hello World: Arduino + XBee + MQTT Leandro Alexandre 7/21/17
Client Connection Munish 7/18/17
can mqtt work well with 100000 brokers? thor 7/18/17
SSL for outside but not inside network ?? Vincèn Pujol 7/17/17
Clarification of keep alive responsibility of client, esp. when using QOS0? Andrew Pullin 7/17/17
Will MQTT topic subscribe occupies a new port? Koma Yip 7/17/17
How to use apache apollo get message from mysql database and add to the queue? Moses 7/16/17
Should MQTT-SN gateway and MQTT broker in the different Linux machine? 7/16/17
Can MQTT be used as a channel between an App and a server? Amr 7/15/17
QOS 1 and RETAIN Behrad Zari 7/14/17
MQTT and Outlier Applications Leif Zars 7/12/17
will message persistence Ozan t 7/12/17
Looking for collaboration on a MQTT delay service for home automation Steve Prior 7/11/17
MQTT for SWI-Prolog (no I'm not kidding) Steve Prior 7/10/17
MQTT and TLS issue on ESP8266 related to KEEPALIVEs John MacLeod 7/10/17
Why Invalid publish topic wildcard? 성야 7/9/17
emqtt broker on Windows Michael Lauer 7/7/17
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