ESP32 Forum

Posted: **Wed Apr 29, 2020 1:54 pm**

I have been trying to simply send data from the web(phone) to the "master" device and it shall send the value to the slaves. But for some reason which I can not figure out the data is send by the master but not recived by the slaves.
I got it to work once, but couple of days later it is not working.

Master code

Code: Select all

#include <esp_now.h>
#include <WiFi.h>
const char* ssid = "ssid>";
const char* password ="pass";
//uint8_t broadcastAddress2[] = {0xCC,0x50,0xE3,0xBE,0xB5,0xD4};
uint8_t broadcastAddress[] = {0xCC,0x50,0xE3,0xBE,0x4C,0xAC};

WiFiServer server(80);
int myData;

 
void setup() {
  // Init Serial Monitor
  Serial.begin(115200);

  WiFi.mode(WIFI_AP_STA);
  Serial.print("Connecting to ::=> "); Serial.println(ssid);
  WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.println("Connecting to WiFi..");
    }
  Serial.println("Success");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  server.begin();
 
  // register second peer 
//  memcpy(peerInfo.peer_addr, broadcastAddress2, 6);
//  if (esp_now_add_peer(&peerInfo) != ESP_OK){
//    Serial.println("Failed to add peer");
//    return;
//  } 
//

  esp_now_init();
  esp_now_register_send_cb(OnDataSent);
   
 
  esp_now_peer_info_t peerInfo;
  peerInfo.channel = 0; 
  peerInfo.encrypt = false;
  // register first peer 
  memcpy(peerInfo.peer_addr, &broadcastAddress, 6);
  if (esp_now_add_peer(&peerInfo) != ESP_OK){
    Serial.println("Failed to add peer");
    return;
  }
  pinMode(19, OUTPUT);
  pinMode(33, OUTPUT);
}
 
void loop() {
  delay(2000);
  esp_err_t result = esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));
   
  if (result == ESP_OK) {
    Serial.println("Sent with success");
  }
  else {
    Serial.println("Error sending the data");
  }
 
  WiFiClient client = server.available();
  if(client) {
    String req = client.readStringUntil('\r');
    client.flush();
    if (req.indexOf("/master_relay19/on") !=-1)
    digitalWrite(19,1);
    else if (req.indexOf("/master_relay19/off") !=-1)
    digitalWrite(19,0);
    else if (req.indexOf("/master_relay33/on") !=-1)
    digitalWrite(33,1);
    else if (req.indexOf("/master_relay33/off") !=-1)
    digitalWrite(33,0);
    else if (req.indexOf("/slave_relay33/on") !=-1)
    myData = 1;
    else if (req.indexOf("/slave_relay33/off") !=-1)
    myData = 2;
    else if (req.indexOf("/slave_relay19/on") !=-1)
    myData = 3;
    else if (req.indexOf("/slave_relay19/off") !=-1)
    myData = 4;
    else if (req.indexOf("/lightswitch_relay19/on") !=-1)
    myData = 5;
    else if (req.indexOf("/lightswitch_relay19/off") !=-1)
    myData = 6;
    }
 
}

// callback when data is sent
void OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {
  char macStr[18];
  Serial.print("Packet to: ");
  // Copies the sender mac address to a string
  snprintf(macStr, sizeof(macStr), "%02x:%02x:%02x:%02x:%02x:%02x",
           mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3], mac_addr[4], mac_addr[5]);
  Serial.print(macStr);
  Serial.print(" send status:\t");
  Serial.println(status == ESP_NOW_SEND_SUCCESS ? "Delivery Success" : "Delivery Fail");
}

Slave code

Code: Select all


#include <esp_now.h>
#include <WiFi.h>

int myData;

// callback function that will be executed when data is received
void OnDataRecv(const uint8_t * mac, const uint8_t *incomingData, int len) {
  memcpy(&myData, incomingData, sizeof(myData));
  Serial.print("Bytes received: ");
  Serial.println(myData);
  if (myData == 5)
    digitalWrite(19,1);
  else if (myData == 6)
    digitalWrite(19,0); 
}
void setup() {
  // Initialize Serial Monitor
  Serial.begin(115200);
  WiFi.mode(WIFI_AP_STA);
  pinMode(19,OUTPUT);
 
 

  // Init ESP-NOW
  if (esp_now_init() != ESP_OK) {
    Serial.println("Error initializing ESP-NOW");
    return;
  }
 

  esp_now_register_recv_cb(OnDataRecv);
 
}

 
void loop() {
Serial.println(WiFi.macAddress());
delay(3000);
}

ESP32 Forum

Can't get esp now and wifi to work together.

Can't get esp now and wifi to work together.