Solution: move general monitoring test utilities to new testutil_monitoring

Solution: add definition to zmq.h

Solution: migrate to unity

Solution: add initial version of documentation

Solution: query the local address and set it

Solution: pass the local address by subclasses to create_engine

Problem: get_socket_address and get_socket_name not available throughout libzmq and restricted to local address

Solution: move to address.hpp/.cpp and generalize

Solution: add monitor event socket option

Problem: socks_connecter_t, vmci_connecter_t and vmci_listener_t duplicate code with stream_*_base_t

Solution: add TODO comments to resolve this debt

Solution: change to refer to the context

Solution: pull up to base class

Solution: added it

Refactor stream listeners and connecters

Fix handling of random port numbers with tipc

Solution: also use get_socket_address from base class

Solution: also use get_socket_address from base class

Solution: perform explicit cast

Solution: extract function create_engine into base class

Solution: extract common base class stream_listener_base_t

Solution: make them private and adapt initialization order

Solution: removed definitions and uses in subclasses

Solution: add underscore prefix

Solution: add underscore prefix

Solution: pull up common code, introduce new create_engine function in base class

Solution: pull up

Solution: pull up tcp_connecter_t::rm_handle and use in all subclasses

Problem: process_plug, get_new_reconnect_ivl and add_reconnect_timer duplicated across subclasses of stream_connector_base_t

Solution: pull up to stream_connector_base_t

Solution: pull up to stream_connecter_base_t

Solution: extract common base class stream_connecter_base_t

Solution: replace by checks against valid value of _handle

Solution: replace by checks against valid value of _handle

Solution: rename to _reconnect_timer_started

Solution: rename to _reconnect_timer_started

Solution: add underscore prefix to data members

Solution: add underscore prefix to data members

Solution: declare _endpoint const

Solution: extract initialization code into get_peer_address function and declare _peer_address const

Solution: assign result to address

Fixes #3376

Solution: remove them

Problem: one more test fails on GNU/Hurd