Prvni ulozeni z chegewara githubu

libraries/ESP32/examples/ESPNow/Multi-Slave/Slave/Slave.ino

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+/**
+   ESPNOW - Basic communication - Slave
+   Date: 26th September 2017
+   Author: Arvind Ravulavaru <https://github.com/arvindr21>
+   Purpose: ESPNow Communication between a Master ESP32 and multiple ESP32 Slaves
+   Description: This sketch consists of the code for the Slave module.
+   Resources: (A bit outdated)
+   a. https://espressif.com/sites/default/files/documentation/esp-now_user_guide_en.pdf
+   b. http://www.esploradores.com/practica-6-conexion-esp-now/
+
+   << This Device Slave >>
+
+   Flow: Master
+   Step 1 : ESPNow Init on Master and set it in STA mode
+   Step 2 : Start scanning for Slave ESP32 (we have added a prefix of `slave` to the SSID of slave for an easy setup)
+   Step 3 : Once found, add Slave as peer
+   Step 4 : Register for send callback
+   Step 5 : Start Transmitting data from Master to Slave(s)
+
+   Flow: Slave
+   Step 1 : ESPNow Init on Slave
+   Step 2 : Update the SSID of Slave with a prefix of `slave`
+   Step 3 : Set Slave in AP mode
+   Step 4 : Register for receive callback and wait for data
+   Step 5 : Once data arrives, print it in the serial monitor
+
+   Note: Master and Slave have been defined to easily understand the setup.
+         Based on the ESPNOW API, there is no concept of Master and Slave.
+         Any devices can act as master or salve.
+*/
+
+#include <esp_now.h>
+#include <WiFi.h>
+
+#define CHANNEL 1
+
+// Init ESP Now with fallback
+void InitESPNow() {
+  WiFi.disconnect();
+  if (esp_now_init() == ESP_OK) {
+    Serial.println("ESPNow Init Success");
+  }
+  else {
+    Serial.println("ESPNow Init Failed");
+    // Retry InitESPNow, add a counte and then restart?
+    // InitESPNow();
+    // or Simply Restart
+    ESP.restart();
+  }
+}
+
+// config AP SSID
+void configDeviceAP() {
+  String Prefix = "Slave:";
+  String Mac = WiFi.macAddress();
+  String SSID = Prefix + Mac;
+  String Password = "123456789";
+  bool result = WiFi.softAP(SSID.c_str(), Password.c_str(), CHANNEL, 0);
+  if (!result) {
+    Serial.println("AP Config failed.");
+  } else {
+    Serial.println("AP Config Success. Broadcasting with AP: " + String(SSID));
+  }
+}
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("ESPNow/Basic/Slave Example");
+  //Set device in AP mode to begin with
+  WiFi.mode(WIFI_AP);
+  // configure device AP mode
+  configDeviceAP();
+  // This is the mac address of the Slave in AP Mode
+  Serial.print("AP MAC: "); Serial.println(WiFi.softAPmacAddress());
+  // Init ESPNow with a fallback logic
+  InitESPNow();
+  // Once ESPNow is successfully Init, we will register for recv CB to
+  // get recv packer info.
+  esp_now_register_recv_cb(OnDataRecv);
+}
+
+// callback when data is recv from Master
+void OnDataRecv(const uint8_t *mac_addr, const uint8_t *data, int data_len) {
+  char macStr[18];
+  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("Last Packet Recv from: "); Serial.println(macStr);
+  Serial.print("Last Packet Recv Data: "); Serial.println(*data);
+  Serial.println("");
+}
+
+void loop() {
+  // Chill
+}