Arduino Library - pubsubclient

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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: http://pubsubclient.knolleary.net

Limitations

It can only publish QoS 0 messages. It can subscribe at QoS 0 or QoS 1.
The maximum message size, including header, is 128 bytes by default. This is configurable via MQTT_MAX_PACKET_SIZE inPubSubClient.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 inPubSubClient.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

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.

2.6
Revert breaking change to callback signature

2.5
Add a library.json file for PlatformIO
Handle dns failure on connect properly
Made use of callback std::function ESP8266-specific
Allow existing #-defines to be predefined

2.4
Add MQTT_SOCKET_TIMEOUT to prevent it blocking indefinitely whilst waiting for inbound data
Fixed return code when publishing >256 bytes

2.3
Add publish(topic,payload,retained) function

2.2
Change code layout to match Arduino Library reqs

2.1
Add MAX_TRANSFER_SIZE def to chunk messages if needed
Reject topic/payloads that exceed MQTT_MAX_PACKET_SIZE

2.0
Add (and default to) MQTT 3.1.1 support
Fix PROGMEM handling for Intel Galileo/ESP8266
Add overloaded constructors for convenience
Add chainable setters for server/callback/client/stream
Add state function to return connack return code

2.6

Revert breaking change to callback signature

2.5

Add a library.json file for PlatformIO

Handle dns failure on connect properly

Made use of callback std::function ESP8266-specific

Allow existing #-defines to be predefined

2.4

Add MQTT_SOCKET_TIMEOUT to prevent it blocking indefinitely whilst waiting for inbound data

Fixed return code when publishing >256 bytes

2.3

Add publish(topic,payload,retained) function

2.2

Change code layout to match Arduino Library reqs

2.1

Add MAX_TRANSFER_SIZE def to chunk messages if needed

Reject topic/payloads that exceed MQTT_MAX_PACKET_SIZE

2.0

Add (and default to) MQTT 3.1.1 support

Fix PROGMEM handling for Intel Galileo/ESP8266

Add overloaded constructors for convenience

Add chainable setters for server/callback/client/stream

Add state function to return connack return code

Download pubsubclient @ github.com

[#/arduino/libraries/pubsubclient” ]

Zoeken

Arduino Library – pubsubclient

Arduino Client for MQTT