R Under development (unstable) (2024-01-14 r85805 ucrt) -- "Unsuffered Consequences"
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> suppressPackageStartupMessages(library(pbdZMQ))
> 
> ### zmq interface
> 
> ### In general and separate files
> # server_context = zmq.ctx.new()
> # server_socket = zmq.socket(server_context, ZMQ.ST()$REP)
> # client_context = zmq.ctx.new()
> # client_socket = zmq.socket(client_context, ZMQ.ST()$REQ)
> ### Server file
> # zmq.setsockopt(server_socket, ZMQ.SO()$CONNECT_TIMEOUT, 1000L)
> # zmq.setsockopt(server_socket, ZMQ.SO()$RCVTIMEO, 1000L)
> # zmq.setsockopt(server_socket, ZMQ.SO()$SNDTIMEO, 1000L)
> # zmq.bind(server_socket, "tcp://*:55555")
> ### client file
> # zmq.setsockopt(client_socket, ZMQ.SO()$CONNECT_TIMEOUT, 1000L)
> # zmq.setsockopt(client_socket, ZMQ.SO()$RCVTIMEO, 1000L)
> # zmq.setsockopt(client_socket, ZMQ.SO()$SNDTIMEO, 1000L)
> # zmq.connect(client_socket, "tcp://localhost:55555")
> 
> ### For CRAN testing in local (the same process) only to avoid block
> cran_context = zmq.ctx.new()
> server_socket = zmq.socket(cran_context, ZMQ.ST()$REP)
> client_socket = zmq.socket(cran_context, ZMQ.ST()$REQ)
> ### Server
> zmq.bind(server_socket, "inproc://#1")
> ### client
> zmq.connect(client_socket, "inproc://#1")
> 
> 
> ### Test pbdZMQ
> tester = function(indata)
+ {
+   zmq.msg.send(indata, client_socket)
+   c2s <- zmq.msg.recv(server_socket)
+   stopifnot(all.equal(c2s, indata))
+ 
+   zmq.send(server_socket, "ok")
+   s2c <- zmq.recv(client_socket)
+   stopifnot(all.equal(s2c$buf, "ok"))
+ }
> 
> tester("test")
> tester(1:5)
> 
> zmq.close(server_socket)
> zmq.close(client_socket)
> 
> proc.time()
   user  system elapsed 
   0.14    0.06    0.18