Reorganizing library structure, prep for 2.0.0
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2.4
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* Add MQTT_SOCKET_TIMEOUT to prevent it blocking indefinitely
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whilst waiting for inbound data
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* Fixed return code when publishing >256 bytes
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2.3
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* Add publish(topic,payload,retained) function
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2.2
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* Change code layout to match Arduino Library reqs
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2.1
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* Add MAX_TRANSFER_SIZE def to chunk messages if needed
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* Reject topic/payloads that exceed MQTT_MAX_PACKET_SIZE
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2.0
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* Add (and default to) MQTT 3.1.1 support
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* Fix PROGMEM handling for Intel Galileo/ESP8266
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* Add overloaded constructors for convenience
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* Add chainable setters for server/callback/client/stream
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* Add state function to return connack return code
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1.9
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* Do not split MQTT packets over multiple calls to _client->write()
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* API change: All constructors now require an instance of Client
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to be passed in.
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* Fixed example to match 1.8 api changes - dpslwk
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* Added username/password support - WilHall
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* Added publish_P - publishes messages from PROGMEM - jobytaffey
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1.8
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* KeepAlive interval is configurable in PubSubClient.h
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* Maximum packet size is configurable in PubSubClient.h
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* API change: Return boolean rather than int from various functions
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* API change: Length parameter in message callback changed
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from int to unsigned int
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* Various internal tidy-ups around types
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1.7
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* Improved keepalive handling
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* Updated to the Arduino-1.0 API
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1.6
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* Added the ability to publish a retained message
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1.5
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* Added default constructor
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* Fixed compile error when used with arduino-0021 or later
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1.4
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* Fixed connection lost handling
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1.3
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* Fixed packet reading bug in PubSubClient.readPacket
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1.2
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* Fixed compile error when used with arduino-0016 or later
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1.1
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* Reduced size of library
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* Added support for Will messages
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* Clarified licensing - see LICENSE.txt
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1.0
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* Only Quality of Service (QOS) 0 messaging is supported
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* The maximum message size, including header, is 128 bytes
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* The keepalive interval is set to 30 seconds
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* No support for Will messages
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Copyright (c) 2008-2015 Nicholas O'Leary
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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@@ -0,0 +1,47 @@
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# Arduino Client for MQTT
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This library provides a client for doing simple publish/subscribe messaging with
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a server that supports MQTT.
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## Examples
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The library comes with a number of example sketches. See File > Examples > PubSubClient
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within the Arduino application.
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Full API documentation is available here: http://pubsubclient.knolleary.net
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## Limitations
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- It can only publish QoS 0 messages. It can subscribe at QoS 0 or QoS 1.
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- The maximum message size, including header, is **128 bytes** by default. This
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is configurable via `MQTT_MAX_PACKET_SIZE` in `PubSubClient.h`.
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- The keepalive interval is set to 15 seconds by default. This is configurable
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via `MQTT_KEEPALIVE` in `PubSubClient.h`.
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- The client uses MQTT 3.1.1 by default. It can be changed to use MQTT 3.1 by
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changing value of `MQTT_VERSION` in `PubSubClient.h`.
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## Compatible Hardware
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The library uses the Arduino Ethernet Client api for interacting with the
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underlying network hardware. This means it Just Works with a growing number of
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boards and shields, including:
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- Arduino Ethernet
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- Arduino Ethernet Shield
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- Arduino YUN – use the included `YunClient` in place of `EthernetClient`, and
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be sure to do a `Bridge.begin()` first
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- Arduino WiFi Shield - if you want to send packets > 90 bytes with this shield,
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enable the `MQTT_MAX_TRANSFER_SIZE` define in `PubSubClient.h`.
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- Sparkfun WiFly Shield – [library](https://github.com/dpslwk/WiFly)
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- TI CC3000 WiFi - [library](https://github.com/sparkfun/SFE_CC3000_Library)
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- Intel Galileo/Edison
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- ESP8266
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The library cannot currently be used with hardware based on the ENC28J60 chip –
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such as the Nanode or the Nuelectronics Ethernet Shield. For those, there is an
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[alternative library](https://github.com/njh/NanodeMQTT) available.
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## License
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This code is released under the MIT License.
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