「arduino」Wi-Fi Shield發送byte array

重點在於這二行，使得Wi-Fi改用byte array傳送資料。

byte message[]={0xA9,0x04,0x01,0x00,0x76,0x86,0x9C};
client.write(message,sizeof(message));

#include <SPI.h>
#include <WiFi.h>

char ssid[] = "qoo"; //  your network SSID (name) 
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;
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128);  // numeric IP for Google (no DNS)
char server[] = "10.10.100.254";    // name address for Google (using DNS)

// Initialize the Ethernet client library
// with the IP address and port of the server 
// that you want to connect to (port 80 is default for HTTP):
WiFiClient client;

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 firmware version
  Serial.print(F("Firmware version: "));
  Serial.println(WiFi.firmwareVersion());
  
  // 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);
  status = WiFi.begin(ssid);
    // wait 10 seconds for connection:
    delay(10000);
  } 
  Serial.println("Connected to wifi");
  printWifiStatus();
  
  Serial.println("\nStarting connection to server...");
  // if you get a connection, report back via serial:
  if (client.connect(server, 8899)) {
    Serial.println("connected to server");
    
    byte message[]={0xA9,0x04,0x01,0x00,0x76,0x86,0x9C};
    client.write(message,sizeof(message));
    
     if (client.available() > 0) {
      // read the bytes incoming from the client:
      char thisChar = client.read();
      // echo the bytes to the server as well:
      Serial.write(thisChar);
    }
    //client.println("Connection: close");
  }
}

void loop() {
  // if there are incoming bytes available 
  // from the server, read them and print them:
  while (client.available()) {
    char c = client.read();
    Serial.write(c);
  }

  // if the server's disconnected, stop the client:
  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting from server.");
    client.stop();

    // do nothing forevermore:
    while(true);
  }
}


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");
}