Update PubSubClient

[vigneshmanix]

Updated from version 1.9 to 2.3
Fixes #769

Changes

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

[robertinant]

Thanks for the pull request @vigneshmanix! Can you please confirm that this library compiles for all Energia platforms?

[vigneshmanix]

Build is successful in OSX 10.11.1, using Apache Ant(TM) version 1.9.6 compiled on June 29 2015
Compiled, uploaded and verified DualBlink_430 example on M430G2553
Unfortunately, I do not have access to other operating systems or LaunchPads
Can someone please verify

[McFizh]

I can verify that this library works with CC3200 board (non EMT) on 64-bit Linux, with Energia 17 . I tried it against hivemq public broken.

Ps. There 2.4 version of the library available (although with only small fixes)