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FDRS_Gateway/FDRS_Relay.ino

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+//  FARM DATA RELAY SYSTEM
+//
+//  RELAY MODULE
+//
+//  Developed by Timm Bogner (bogner1@gmail.com) for Sola Gratia Farm in Urbana, Illinois, USA.
+//  Setup instructions located in the "fdrs_config.h" file.
+
+#if defined(ESP8266)
+#include <ESP8266WiFi.h>
+#include <espnow.h>
+#elif defined(ESP32)
+#include <esp_now.h>
+#include <WiFi.h>
+#include <esp_wifi.h>
+#endif
+#include "fdrs_config.h"
+
+uint8_t prevAddress[] = {0xAA, 0xBB, 0xCC, 0xDD, 0xEE, PREV_MAC};
+uint8_t selfAddress[] = {0xAA, 0xBB, 0xCC, 0xDD, 0xEE, UNIT_MAC};
+uint8_t nextAddress[] = {0xAA, 0xBB, 0xCC, 0xDD, 0xEE, NEXT_MAC};
+uint8_t outMAC[] = {0xAA, 0xBB, 0xCC, 0xDD, 0xEE, DEFT_MAC};
+uint8_t incMAC[6];
+
+uint8_t theData[250];
+uint8_t ln;
+bool newData = false;
+
+void passOn() {
+  switch (incMAC[5]) {
+    case PREV_MAC:
+      outMAC[5] = NEXT_MAC;
+      break;
+    case NEXT_MAC:
+      outMAC[5] = PREV_MAC;
+      break;
+    default:
+      outMAC[5] = DEFT_MAC;
+      break;
+  }
+
+  Serial.print("Packet Received from device: ");
+  Serial.println(incMAC[5]);
+  Serial.print("and sending to: ");
+  Serial.println(outMAC[5]);
+  esp_now_send(outMAC, (uint8_t *) &theData, ln);
+}
+
+// Set ESP-NOW send and receive callbacks for either ESP8266 or ESP32
+#if defined(ESP8266)
+void OnDataSent(uint8_t *mac_addr, uint8_t sendStatus) {
+  Serial.print("Last Packet Send Status: ");
+  if (sendStatus == 0) {
+    Serial.println("Delivery success");
+  }
+  else {
+
+    Serial.println("Delivery fail");
+  }
+}
+void OnDataRecv(uint8_t* mac, uint8_t *incomingData, uint8_t len) {
+#elif defined(ESP32)
+void OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {
+  Serial.print("Last Packet Send Status:");
+  Serial.println(status == ESP_NOW_SEND_SUCCESS ? "Delivery Success" : "Delivery Fail");
+}
+void OnDataRecv(const uint8_t * mac, const uint8_t *incomingData, int len) {
+#endif
+  memcpy(&theData, incomingData, sizeof(theData));
+  memcpy(&incMAC, mac, sizeof(incMAC));
+//  if (memcmp(&incMAC, &selfAddress, 5) != 0){
+//      Serial.print("not local");
+//    return;
+//  }
+  Serial.print("Data received: ");
+  Serial.println(len);
+  ln = len;
+  newData = true;
+}
+
+void setup() {
+  // Init Serial Monitor
+  Serial.begin(115200);
+  // Init WiFi
+  WiFi.mode(WIFI_STA);
+  WiFi.disconnect();
+  // Init ESP-NOW for either ESP8266 or ESP32 and set MAC address
+#if defined(ESP8266)
+  wifi_set_macaddr(STATION_IF, selfAddress);
+  if (esp_now_init() != 0) {
+    return;
+  }
+  esp_now_set_self_role(ESP_NOW_ROLE_COMBO);
+  esp_now_register_send_cb(OnDataSent);
+  esp_now_register_recv_cb(OnDataRecv);
+  // Register peers
+  esp_now_add_peer(prevAddress, ESP_NOW_ROLE_COMBO, 0, NULL, 0);
+  esp_now_add_peer(nextAddress, ESP_NOW_ROLE_COMBO, 0, NULL, 0);
+#elif defined(ESP32)
+  esp_wifi_set_mac(WIFI_IF_STA, &selfAddress[0]);
+  if (esp_now_init() != ESP_OK) {
+    Serial.println("Error initializing ESP-NOW");
+    return;
+  }
+  esp_now_register_send_cb(OnDataSent);
+  esp_now_register_recv_cb(OnDataRecv);
+  esp_now_peer_info_t peerInfo;
+  peerInfo.channel = 0;
+  peerInfo.encrypt = false;
+  // Register first peer
+  memcpy(peerInfo.peer_addr, prevAddress, 6);
+  if (esp_now_add_peer(&peerInfo) != ESP_OK) {
+    Serial.println("Failed to add peer");
+    return;
+  }
+  // Register second peer
+  memcpy(peerInfo.peer_addr, nextAddress, 6);
+  if (esp_now_add_peer(&peerInfo) != ESP_OK) {
+    Serial.println("Failed to add peer");
+    return;
+  }
+#endif
+
+  Serial.println();
+  Serial.println("FARM DATA RELAY SYSTEM :: Relay Module");
+  Serial.println("MAC:" + WiFi.macAddress());
+  Serial.print("Previous device: ");
+  Serial.println(PREV_MAC);
+  Serial.print("Next device: ");
+  Serial.println(NEXT_MAC);
+  Serial.print("Default device: ");
+  Serial.println(DEFT_MAC);
+  Serial.println(" ");
+}
+
+void loop() {
+  if (newData) {
+    newData = false;
+    passOn();
+  }
+}