+2019 September 19; version 1.8.0
+ New message types added:
+ RAN_CONNECTED, RAN_RESTARTED, RAN_RECONFIGURED
+
+2019 September 17; version 1.7.0
+ Initial connection mode now defaults to asynchronous. Set RMR_ASYNC_CONN=0
+ in the environment before rmr_init() is invoked to revert to
+ synchronous first TCP connections. (Recovery connection attempts
+ have always been asynchronous).
+