87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
/*
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* This sketch sends random data over UDP on a ESP32 device
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*
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*/
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#include <WiFi.h>
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#include <WiFiUdp.h>
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// WiFi network name and password:
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const char * networkName = "CAIDA-LIBRE";
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const char * networkPswd = "caidalibre";
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//IP address to send UDP data to:
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// either use the ip address of the server or
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// a network broadcast address
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const char * udpAddress = "192.168.8.255";
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const int udpPort = 3333;
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//Are we currently connected?
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boolean connected = false;
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//The udp library class
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WiFiUDP udp;
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void setup(){
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// Initilize hardware serial:
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Serial.begin(115200);
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//Connect to the WiFi network
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connectToWiFi(networkName, networkPswd);
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}
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uint8_t buffer[50] = "hello world";
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void loop(){
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//only send data when connected
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if(connected){
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// //Send a packet
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// udp.beginPacket(udpAddress,udpPort);
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// udp.printf("Seconds since boot: %u", millis()/1000);
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// udp.endPacket();
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memset(buffer, 0, 50);
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//processing incoming packet, must be called before reading the buffer
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udp.parsePacket();
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//receive response from server, it will be HELLO WORLD
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if(udp.read(buffer, 50) > 0){
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Serial.print("Server to client: ");
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Serial.println((char *)buffer);
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}
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}
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//Wait for 1 second
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delay(1000);
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}
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void connectToWiFi(const char * ssid, const char * pwd){
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Serial.println("Connecting to WiFi network: " + String(ssid));
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// delete old config
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WiFi.disconnect(true);
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//register event handler
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WiFi.onEvent(WiFiEvent);
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//Initiate connection
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WiFi.begin(ssid, pwd);
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Serial.println("Waiting for WIFI connection...");
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}
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//wifi event handler
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void WiFiEvent(WiFiEvent_t event){
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switch(event) {
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case SYSTEM_EVENT_STA_GOT_IP:
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//When connected set
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Serial.print("WiFi connected! IP address: ");
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Serial.println(WiFi.localIP());
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//initializes the UDP state
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//This initializes the transfer buffer
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udp.begin(WiFi.localIP(),udpPort);
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connected = true;
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break;
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case SYSTEM_EVENT_STA_DISCONNECTED:
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Serial.println("WiFi lost connection");
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connected = false;
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break;
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}
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}
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