Hello everyone,
In the server chat example code for the WiFi shield, the description shows how a client can communicate with a chat server the shield creates on Telnet. However, when I added a second client on to this server the second client was not able to connect. I used the following code from the example and modified it slightly to have two clients.
#include <SPI.h>
#include <WiFi.h>
char ssid[] = "myqwest2629"; // your network SSID (name) sa
char pass[] = "****************"; // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0; // your network key Index number (needed only for WEP)
int status = WL_IDLE_STATUS;
WiFiServer server(23);
boolean alreadyConnected = false; // whether or not the client was connected previously
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue:
while(true);
}
// attempt to connect to Wifi network:
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);
// wait 10 seconds for connection:
delay(10000);
}
// start the server:
server.begin();
// you're connected now, so print out the status:
printWifiStatus();
}
void loop() {
// first client:
WiFiClient client = server.available();
//second client:
WiFiClient client_2 = server.available();
// when the client sends the first byte, say hello:
if (client) {
if (!alreadyConnected) {
// clead out the input buffer:
client.flush();
Serial.println("We have a new client");
client.println("Hello, client!");
alreadyConnected = true;
}
if (client.available() > 0) {
// read the bytes incoming from the client:
char thisChar = client.read();
// echo the bytes back to the client:
server.write(thisChar);
// echo the bytes to the server as well:
Serial.write(thisChar);
}
}
// Second client
if (client_2) {
if (!alreadyConnected) {
// clead out the input buffer:
client_2.flush();
Serial.println("We have a new client");
client_2.println("Hello, client!");
alreadyConnected = true;
}
if (client_2.available() > 0) {
// read the bytes incoming from the client:
char thisChar_1 = client_2.read();
// echo the bytes back to the client:
server.write(thisChar_1);
// echo the bytes to the server as well:
Serial.write(thisChar_1);
}
}
}
void printWifiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}
I’m not sure if this code is written incorrectly or that this is physically not possible. Any suggestions will greatly help.
Thank You!!!