Arduino Client for MQTT

This library provides a client for doing simple publish/subscribe messaging with a server that supports MQTT.

Examples

The library comes with a number of example sketches. See File > Examples > PubSubClient within the Arduino application.

Full API documentation is available here: https://pubsubclient.knolleary.net

Limitations

It can subscribe at QoS 0 or 1.
It can publish at QoS 0, 1 or 2. WARNING! No retransmission is supported to keep the library as much memory friendly as possible. (Without retransmission support, the publish QoS is only meaningful when the broker sends your message to a subscriber, supposing that the subscriber subscribes with a QoS greater then or equal to the publish QoS; consider that MQTT runs over TCP, so retransmission isn't really required in most cases, especially when publishing to the broker)
The maximum message size, including header, is 128 bytes by default. This is configurable via MQTT_MAX_PACKET_SIZE in PubSubClient.h.
The keepalive interval is set to 15 seconds by default. This is configurable via MQTT_KEEPALIVE in PubSubClient.h.
The client uses MQTT 3.1.1 by default. It can be changed to use MQTT 3.1 by changing value of MQTT_VERSION in PubSubClient.h.

Compatible Hardware

The library uses the Arduino Ethernet Client api for interacting with the underlying network hardware. This means it Just Works with a growing number of boards and shields, including:

Arduino Ethernet
Arduino Ethernet Shield
Arduino YUN – use the included YunClient in place of EthernetClient, and be sure to do a Bridge.begin() first
Arduino WiFi Shield - if you want to send packets > 90 bytes with this shield, enable the MQTT_MAX_TRANSFER_SIZE define in PubSubClient.h.
Sparkfun WiFly Shield – library
TI CC3000 WiFi - library
Intel Galileo/Edison
ESP8266
ESP32

The library cannot currently be used with hardware based on the ENC28J60 chip – such as the Nanode or the Nuelectronics Ethernet Shield. For those, there is an alternative library available.

License

This code is released under the MIT License.

License

Suxsem/pubsubclient

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