WiFi Shield - Packet Source Port

Using Arduino Networking, Protocols, and Devices
#1

I am trying to use WiFi Shield to send some UDP packets to my devices(Ardrone), and the devices will return some UDP packets to Arduino. I need to the source port to get the response.

Is there any way to check Arduino UDP sending packet source port?

#2

It should be the same as the ethernet shield's udp functions. Here is how you get the sender's ip and port so you can send a response packet. I think that is what you are asking.

#3

Thanks for your reply.

I means that if Arduino sends UDP packet from port 32201 (assume), the sender will send response packet back to Arduino port 32201. I have to set Arduino listen from port 32201 to receive response.

#4

You should have to do that before sending the packet.

WiFiUDP.begin(32201);
#5

um… But I don’t know which source port that arduino using to send my UDP packet… And I have to get this information.

Thank you.

#6

This is the Arduino code for starting a socket listening for udp packets. I selected port 8888 for this example. You can use that if you wish.

WiFiUDP Udp;
int localport 8888;

// then in setup() after starting your wifi card
if(!Udp.begin(localport)) Serial.println(F("No socket available"));

Now it will listen for udp packets on port 8888.

#7