User Manual

To read incoming data in the receive callback handler, you need to use the pTCP pointer, as shown in the sample code

below:

Example: Callback Based HTTP Request

The following example shows how you can register and use the two TCP callbacks, and performs a simple TCP

operation. It opens a TCP socket to an HTTP server using port 80, requests a page, displays any incoming response

data, and then waits for the HTTP server to close the TCP connection (which will show up as a disconnect callback):

// Set the callback handlers for RX and disconnect

tcp.setReceivedCallback(receive_callback);

tcp.setDisconnectCallback(disconnect_callback);

void receive_callback(void)

{

int c;

// Print out any bytes available from the TCP server

while ( (c = tcp.read())> 0 )

{

Serial.write( (isprint(c) || iscntrl(c)) ? ((char)c) : '.');

}

void disconnect_callback(void)

{

Serial.println();

Serial.println("-------------------");

Serial.println("DISCONNECT CALLBACK");

Serial.println("-------------------");

Serial.println();

}

#include <adafruit_feather.h>

#define WLAN_SSID "SSID"

#define WLAN_PASS "PASSWORD"

#define WLAN_SECURITY ENC_TYPE_AUTO

#define TCP_DOMAIN "www.adafruit.com"

#define TCP_FILENAME "/testwifi/index.html"

#define TCP_PORT 80

void receive_callback ( void );

void disconnect_callback ( void );

AdafruitTCP tcp;

void setup()

{

Serial.begin(115200);

// Wait for Serial port to connect. Needed for native USB port only

while (!Serial) { delay(1); }

// Attempt to connect to the AP using the specified SSID/key/encoding