UDP communications handling

UDP message implementation that helps with management of unicast/multicast semantics and repeat & delay handling.

WS-Discovery spec dictates that the example algorithm provided in SOAP-over-UDP spec is to be used; see

http://docs.oasis-open.org/ws-dd/soapoverudp/1.1/os/wsdd-soapoverudp-1.1-spec-os.html#_Toc229451838

class wsdiscovery.udp.UDPMessage(env, addr, port, msgType, initialDelay=0)

UDP message management implementation

MULTICAST = 'multicast'
UNICAST = 'unicast'
canSend()
getAddr()
getEnv()
getPort()
isFinished()
msgType()
refresh()