   // Compose a request for the server according to the agreed format:
   // /set_rssi/:device_id/:mac_addr1/:rssi1/:mac_addr2?/ ... /:mac_addr10?/:rssi10/?
   String request = "/set_rssi/:";
-  request += device_id;
+  request += DEVICE_ID;
   request += "/:";
   for (auto datapoint : datapoints) {
     request += datapoint.first; // The MAC address

#include <ESP8266WiFi.h>
#include "wifi_credentials.h"

#define device_id 1;

ESP8266WiFiClass wifi;
const char SERVER_IP[] = "192.168.0.136";
const int8_t CONNECTION_RETRIES = 3; // The maximum amount of wifi connection attempts
const uint8_t TRANSMISSION_SIZE = 10;

  digitalWrite(TX_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TX_PIN, LOW);
  espPower.deepSleep(60 * 1000000UL); // Will sleep forever unless wakeup pin connected to RST
}

void setup() {
