Hello community,
I want to communicate simultaneously with 4 Devices via AsUDP.
Is it possiple to open more than one Connection with UdpOpen? I got the same ident when I open on the same Ethernetdevice a second UDP-Socket.
UdpConnect connects with the correct Destination-IP to the device, but the Instance of UdpClient points to the last opened and connected Device.
Is it possible to get an example how to connect and communicate at a time to more than one Udp-Device?
Thanks for anwering.
greetings
Frank
Hi,
I was curious and did some testing about UdpOpen() options I’ve never used before.
It looks like that by using the options udpOPT_REUSEADDR + udpOPT_REUSEPORT with UdpOpen() you could achive your goal using the same port with different remote station bindings by UdpConnect().
I called 3 UdpOpen() instances with the options mentioned above, bound 2 of the idents to 2 different remote stations + dedicated ports and left the third ident unbound.
Then I used all 3 idents from UdpOpen() for receiving data.
And voila, it looks like that the 2 bound sockets just received the data from the remote stations + port bound, and the 3rd socket received “anything else” that was sent to the open UDP port (for sure, the 3rd one is not mandatory for the use-case I understood, but was a nice-to-have to see what happens).
Hope that information helps to realize your use-case.
Best regards!
PS: if your use-case allows to open a different UDP port for each remote station, just forget everything above 
This is possible without the reusage of the same port, and even without connecting the port.
Hello Alexander,
thanks for your help. Now it works with the options: UDPClient.UdpOpen_0.options := udpOPT_REUSEADDR OR udpOPT_REUSEPORT;
For every UPD-Connection i have one instance. When starting, I allow only one UDP-Socket-Build at a time: UdpOpen_0() and then UdpConnect_0().
After that initialization the five instances work asynchoniously.
Greetings,
Frank
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Just to mention it but multicast adresses would also be an option to send one telegram to a group or receivers
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