The recommended PubNub SDK for Raspberry Pi is POSIX C:

https://github.com/pubnub/c-core/tree/master/posix

For C++ :

https://github.com/pubnub/c-core/tree/master/cpp

You can also use any PubNub SDK on Linux, like:

https://github.com/pubnub/python

https://github.com/pubnub/java

https://github.com/pubnub/javascript

https://github.com/pubnub/ruby

https://github.com/pubnub/go