v2.8

• Add setBufferSize() to override MQTT_MAX_PACKET_SIZE
• Add setKeepAlive() to override MQTT_KEEPALIVE
• Add setSocketTimeout() to overide MQTT_SOCKET_TIMEOUT
• Added check to prevent subscribe/unsubscribe to empty topics
• Declare wifi mode prior to connect in ESP example
• Use strnlen to avoid overruns
• Support pre-connected Client objects

v2.7

• Fix remaining-length handling to prevent buffer overrun
• Add large-payload API - beginPublish/write/publish/endPublish
• Add yield call to improve reliability on ESP
• Add Clean Session flag to connect options
• Add ESP32 support for functional callback signature
• Various other fixes

v2.6

• Revert breaking change to callback signature

v2.5: Update library files

• 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

v2.4

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

v2.3

• Add publish(topic,payload,retained) function

v2.2

• Change code layout to match Arduino Library reqs

v2.1

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

v2.0

• 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