I found the application https://packetsender.com/documentation and it turned out that it work great, if you know how to use the command line switches....
Using the portable version I can send UDP messages using this syntax:
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packetsender -b <port> -u -A <ip>.255 <port> "<data>"
packetsender -b 1234 -u -A 192.168.1.255 1234 "send this as ASCII, -b is the outgoing UDP port, -u is protocol UDP, -A parse data as ASCII, the last three parameters are the IP (send to 255 to send to all), port once again, and last the message with " ... "
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packetsender -b <port> -u -w 60000 -A <any ip> <port> "<null>"
packetsender -b 1234 -u -w 60000 -A 127.0.0.1 1234 "bogus"