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UDP Broadcast send

How should I send correctly data broadcast to destination like 192.168.XXX.255...

Using sock.targetbcast = YES send to destination 255.255.255.255
Using sock.targetip = 192.168.xxx.255 send nothing

Using combine properties of sock.targetbcast & sock.targetip send first time to destination 192.168.xxx.255, but next 255.255.255.255 only
 
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