If it does then either you need to set destMAC or create a valid checksum (or you may find other issues during the exercise of building an identical Packet). The only suggestion I can make is to create a Packet from the Microcontroller that looks exactly like the one you're comparing it to and see if it gets through. streaming Sound / Video if the odd piece of data doesn't arrive it doesn't make much difference to the output.) It's normal use is in those Applications where it doesn't matter if all the data doesn't get through (e.g. If anything arrives on a Port that the IP Address is bound to it will trigger the DataArrival event. It's also Conectionless as DM has stated, basically you Bind your Network Adapter (IP Address) to a local Port, assign the RemotePort and send the data. There's no error correction or retransmissions etc. Essentially it puts a packet onto the Network and forgets about it. UDP is known as an Unreliable Protocol since it has very little checks and balances.
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