ESP32/ESP8266 使用WIFI模块进行UDP通信 - 米思齐/Arduino

使用UDP协议, 进行通信

• ESP32以AP模式运行
• ESP8266以STA模式运行
• ESP8266每五秒发送"hello"
• ESP32实时接受ESP8266发送的消息

注意 

• 使用WiFi时, ADC2模拟通道无法使用
• ADC2 10个通道：GPIO0、GPIO2、GPIO4、GPIO12-GPIO15、GOIO25-GPIO27
• ADC1 8通道：GPIO32 - GPIO39

ESP - Ap 接收端

#include <WiFi.h>
#include <WiFiUDP.h>const char AP_NameChar[] = "WIFI-SSID";
const char WiFiAPPSK[] = "WIFI-PSK";
IPAddress ESP8266ip1(192,168,4,2);
IPAddress ESP8266ip2(192,168,4,3);
IPAddress ESP8266ip(192,168,4,255);
unsigned int localPort =8080;
unsigned int remotePort=8080;
char incomingPacket[537];
char A;
WiFiUDP Udp;void setup(){Serial.begin(9600);WiFi.mode(WIFI_AP);WiFi.softAP(AP_NameChar, WiFiAPPSK);Udp.begin(localPort);Serial.println();Serial.println("Started ap. Local ip: " + WiFi.softAPIP().toString());Serial.begin(9600);
}void loop(){int packetSize = Udp.parsePacket();if (packetSize){Serial.printf("Received %d bytes from %s, port %d\n", packetSize, Udp.remoteIP().toString().c_str(), Udp.remotePort());int len = Udp.read(incomingPacket, 536);if (len > 0){incomingPacket[len] = 0;Serial.printf("UDP packet contents: %s\n", incomingPacket);String COM=incomingPacket;Serial.println(COM);}}}

ESP - STA 发送端

#define STASSID "WIFI-SSID"
#define STAPSK "WIFI-PSK"
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include <ESP8266WiFi.h>unsigned int localPort =8080;
unsigned int remotePort=8080;
char incomingPacket[537];
char A;
WiFiUDP Udp;void setup(){Serial.begin(9600);WiFi.mode(WIFI_STA);WiFi.begin(STASSID, STAPSK);while (WiFi.status() != WL_CONNECTED){Serial.print(".");delay(500);}delay(1000);Serial.println();Serial.print("Connected! IP address: ");Serial.println(WiFi.localIP());Serial.printf("UDP server on port  ", localPort);Udp.begin(localPort);Serial.begin(9600);Serial.print(WiFi.localIP());
}void loop(){Udp.beginPacket("192.168.4.1",remotePort);Udp.print("hello");Udp.endPacket();delay(5000);}