heltec_wifi_lora_farmos.ino

#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include <SPI.h>
#include <RH_RF95.h>

#define RFM95_CS 18
#define RFM95_RST 14
#define RFM95_INT 26

// Change to 434.0 or other frequency, must match RX's freq!
#define RF95_FREQ 915.0

// Singleton instance of the radio driver
RH_RF95 rf95(RFM95_CS, RFM95_INT);

const char* ssid = "Temagami-EXT_EXT";
const char* password = "888888pab70";

const char* serverName = "https://edgecollective.farmos.net/farm/sensor/listener/47803f44fef9cf01489d033d2eef4424?private_key=9f6a52fb667566b828069794274fad22";
// the following variables are unsigned longs because the time, measured in
// milliseconds, will quickly become a bigger number than can be stored in an int.

unsigned long lastTime = 0;
// Timer set to 10 minutes (600000)
//unsigned long timerDelay = 600000;
// Set timer to 90 seconds (5000)
unsigned long timerDelay = 90000;

    StaticJsonDocument<200> doc;

int postcount = 0;

void setup() {

    
  Serial.begin(115200);


  while (!rf95.init()) {
    Serial.println("LoRa radio init failed");
    Serial.println("Uncomment '#define SERIAL_DEBUG' in RH_RF95.cpp for detailed debug info");
    while (1);
  }
  Serial.println("LoRa radio init OK!");

  // Defaults after init are 434.0MHz, modulation GFSK_Rb250Fd250, +13dbM
  if (!rf95.setFrequency(RF95_FREQ)) {
    Serial.println("setFrequency failed");
    while (1);
  }
  Serial.print("Set Freq to: "); Serial.println(RF95_FREQ);

  rf95.setTxPower(23, false);
  

  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
 
  Serial.println("Timer set to 5 seconds (timerDelay variable), it will take 5 seconds before publishing the first reading.");
}

void loop() {

 if (rf95.available())
  {

    // Should be a message for us now
    uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
    uint8_t len = sizeof(buf);

    if (rf95.recv(buf, &len))
    {
      RH_RF95::printBuffer("Received: ", buf, len);
      Serial.print("Got: ");
      Serial.println((char*)buf);
       Serial.print("RSSI: ");
      Serial.println(rf95.lastRssi(), DEC);


  doc["temp"] = 23.5;
  doc["humidity"] = 50.2;

Serial.print( (timerDelay - (millis() - lastTime))/1000.);
Serial.println(" sec remain til next POST");

     if ( ( (millis() - lastTime) > timerDelay) || (postcount == 0)) {

  if(WiFi.status()== WL_CONNECTED){
      HTTPClient http;
      
      // Your Domain name with URL path or IP address with path
      http.begin(serverName);

      // Specify content-type header
      //http.addHeader("Content-Type", "application/x-www-form-urlencoded");
      // Data to send with HTTP POST
      //String httpRequestData = "api_key=tPmAT5Ab3j7F9&sensor=BME280&value1=24.25&value2=49.54&value3=1005.14";           
      // Send HTTP POST request
      //int httpResponseCode = http.POST(httpRequestData);
      
      // If you need an HTTP request with a content type: application/json, use the following:
      http.addHeader("Content-Type", "application/json");
      
      //int httpResponseCode = http.POST("{\"api_key\":\"tPmAT5Ab3j7F9\",\"sensor\":\"BME280\",\"value1\":\"24.25\",\"value2\":\"49.54\",\"value3\":\"1005.14\"}");

String output;
  serializeJson(doc, output);

int httpResponseCode = http.POST(output);

     
      Serial.print("HTTP Response code: ");
      Serial.println(httpResponseCode);

        postcount=postcount+1;
        
      // Free resources
      http.end();
      
  }
  else {
      Serial.println("WiFi Disconnected");
    }
      lastTime = millis();

    }
    
    
      // Send a reply
      uint8_t data[] = "And hello back to you";
      rf95.send(data, sizeof(data));
      rf95.waitPacketSent();
      Serial.println("Sent a reply");
    }
    else
    {
      Serial.println("Receive failed");
    }
  
  }

}