网络通信之TCP Client通信（基于Arduino）

#include<ESP8266WiFi.h>
const char*ssid ="STM32L476";
const char*password ="284122348";
const char*serverIP ="115.29.109.104";
int serverPort =6558;
WiFiClient client;
bool bConnected =false;
char buff[512];
int nm =0;
void setup(){
  Serial.begin(115200);
  delay(10);
  Serial.println();
  Serial.println();
  Serial.print("Connecting to");
  Serial.println(ssid);
  WiFi.begin(ssid,password);
  while(WiFi.status()!=WL_CONNECTED){
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi connected");
  Serial.println("IP address:");
  Serial.println(WiFi.localIP());
}
void loop(){
  delay(1);
  if(bConnected ==false)
  {
    if(!client.connect(serverIP,serverPort))
  {
  Serial.println("connection failed");
  delay(5000);
  return;
}
bConnected=true;
Serial.println("connection ok");
}
else if(client.available())
{
Serial.println("data is coming");
while(client.available())
{
  buff[nm++]=client.read();
  if(nm>=511)break;
}
buff[nm]=0x00;
nm=0;
Serial.print(buff);
client.print(buff);
client.flush();
  }
}