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WiFiNINA : Server class

peek()

Description

Read a byte from the file without advancing to the next one. That is, successive calls to peek() will return the same value, as will the next call to read().

This function inherited from the Stream class. See the Stream class main page for more information.

Syntax

server.peek()

Parameters

None

Returns

b: the next byte or character
-1: if none is available

Example

…

#include <SPI.h>
#include <WiFiNINA.h>

char ssid[] = SECRET_SSID;      // your network SSID (name)
char pass[] = SECRET_PASS;      // your network password

int status = WL_IDLE_STATUS;

WiFiServer server(80);

void setup() {

  Serial.begin(9600);
  while (!Serial) {

  }


  if (WiFi.status() == WL_NO_MODULE) {
        Serial.println("Communication with WiFi module failed!");
        // don't continue
        while (true);
  }

  while (status != WL_CONNECTED) {
        Serial.print("Attempting to connect to SSID: ");
        Serial.println(ssid);

        status = WiFi.begin(ssid, pass);


        delay(10000);
  }
  server.begin();
}


void loop() {
  // listen for incoming clients
  WiFiClient client = server.available();
  if (client) {
        Serial.println("new client");
        // an http request ends with a blank line
        boolean currentLineIsBlank = true;
        int i = 0;
        while (client.connected()) {
        if (client.available()) {
        char c = client.peek();
        Serial.print("peek: ");
        Serial.println(c);

        Serial.print("calling a second time peek, the char is the same: ");
        c = client.peek();
        Serial.println(c);

        Serial.print("calling the read retry the char and erase from the buffer: ");
        c = client.read();
        Serial.println(c);
        if (i == 2) {
        while (1);
        }
        i++;

        if (c == '\n') {
        // you're starting a new line
        currentLineIsBlank = true;
        } else if (c != '\r') {
        // you've gotten a character on the current line
        currentLineIsBlank = false;
        }
        }
        }
        // give the web browser time to receive the data
        delay(1);

        // close the connection:
        client.stop();
        Serial.println("client disconnected");
  }
}

…
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See also


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The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.