[网络协议]arduino循环发送http网络请求，处理json数据

#include <SPI.h>
#include <Ethernet.h>
#include <ArduinoJson.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 33, 166);
char serverName[] = "120.24.xx.77";

EthernetClient client;
DynamicJsonDocument doc(110);

char json[200];
int i = 0;

int count = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println("start...");
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    Ethernet.begin(mac, ip);
  }


}

void loop() {
  //delay(1000);
  count = 0;
  i = 0;
  if (client.connect(serverName, 8066)) {
    Serial.println("connected");
    client.println("GET /user/123 HTTP/1.1");
    client.println("Host: 120.24.60.77:8066");
    client.println("Connection: close");
    client.println();
  } else {
    Serial.println("connection failed");
  }

//此处需要等待一段时间，不然没有获取到数据，下面的程序无法进入执行就又重新发起请求了，永远读取不到数据了
  delay(100);
  Serial.println("connecting...");


  while (client.available()) {
    char c = client.read();
    Serial.print(c);

    if ('\n' == c) {
      count++;
    }
    if (count >= 10 && count < 11) {
      json[i++] = c;
    }

  }



  if (!client.connected()) {
    Serial.print("count:");
    Serial.println(count);
    Serial.println("--------------1");
    Serial.println(json);
    Serial.println("--------------2");
    DeserializationError err = deserializeJson(doc, json);

    if (err) {
      Serial.print("Error:");
      Serial.print(err.c_str());
    }

    JsonObject obj = doc.as<JsonObject>();
    String msg = obj["message"];

    Serial.println(msg);
    Serial.println("disconnecting.");
    //client.stop();
    //while (true);
    //delay(1000);
  }
}