diff --git a/crystal/makefile.user b/crystal/makefile.user
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+++ b/crystal/makefile.user
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+WS_SERVICE  ?= 127.0.0.1:8080
+init-websocket-tcpd:
+	@# '-b' binary, '-E' quit on end-of-file, 'ws-l' websocket URI to listen
+	@# each connection is redirected to last parameter
+	websocat -b -E ws-l:$(WS_SERVICE) unix:/tmp/.libipc-run/pong
+
+init-websocket-client:
+	@# websocat -b -E tcp-l:127.0.0.1:9000 ws://127.0.0.1:9999
+	websocat -b -E ws://$(WS_SERVICE)
+
+#
+# The following rules help for debugging stuff.
+# Changes can happen from time to time depending on what I'm working on.
+#
+
+TCP_SERVICE ?= 127.0.0.1:9000
+init-websocket-ipc-unix:
+	@#websocat -b -E ws-l:$(WS_SERVICE) tcp:$(TCP_SERVICE)
+	@#websocat -b -E ws-l:$(WS_SERVICE) | ./bin/input2ipc | nc -U /tmp/.libipc-run/pong
+	websocat -b -E -s 8080 | ./bin/input2ipc | nc -U /tmp/.libipc-run/pong
+
+# 1. read TCP messages (nc),
+# 2. convert them into IPC messages (input2ipc),
+# 3. send them through websocket (websocat).
+init-tcpd-ipc-websocket:
+	nc -k -l 9000 | ./bin/input2ipc | make init-websocket-client