User Manual

Returns: The number of bytes written.

Callback Handlers

AdafruitUDP supports a 'read' callback that will fire every time incoming UDP data is recieved over the open socket

connection.

The callback function has the following signature (although you are free to choose a different name if you wish to):

Before you can use the callback function, you need to register your callback handler (using the function signature in the

paragraph above).

You register the callback with the following function:

void setReceivedCallback (udpcallback_t fp)

Registers the function used to process 'data received' callbacks.

Parameters:

fp: The name of the function where callback events should be redirected to

Returns: Nothing

Examples

The examples below illustration some basic UDP concepts to help you understand the class described above.

UDP Echo Server

The following example will listen on port 8888 for any incoming UDP requests, and then echo them back to the

requesting device via the 'received' callback handler:

void received_callback(void);

See the example section at the bottom of this page for details on using the data received callback in the real

world.

#include <adafruit_feather.h>

#define WLAN_SSID "yourSSID"

#define WLAN_PASS "yourPass"

#define LOCAL_PORT 8888

AdafruitUDP udp;

char packetBuffer[255];

bool connectAP(void)

{

// Attempt to connect to an AP

Serial.print("Attempting to connect to: ");