fix creation of queue on dummy

README.md

@@ -37,5 +37,20 @@ systemctl enable --now /lib/systemd/system/reHDDPrinter.service
 
 see https://github.com/pklaus/brother_ql for details for printer access
 
+## Test IPC msg queue
+### Dummy Sender
+```
+cd dummy_sender
+clear && g++ -Wall main.cpp -o dummy_sender
+clear && ./dummy_sender
+```
 
+### Dummy Receiver
+```
+clear && python ./dummy_receiver.py
+```
 
+### Clear IPC mgs queue
+```
+clear && bash ./cleanup_queues.py
+```