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Device Status Monitoring

Access device battery, GPS, and network status via JSON over BLE.

Overview

Using the Aero-Tracker proprietary service (3F6AECC7-5406-47AB-9A75-0F5CF12EAF8E), you can retrieve detailed device status information including battery level, GPS status, cellular signal strength, and configuration details.

Status Data Protocol

Status data is transmitted as JSON objects terminated with the special marker ##END##:

{"battery_capacity":85,"gps_fix":3,"modem_rsii":15,"version":"1.2.3"}##END##

Important: Always buffer incoming data until you encounter the ##END## marker before attempting to parse the JSON.

Complete Status Interface

interface MyDeviceStatus {
  id?: string;
  salt?: string;
  model?: string;
  status?: 'paired' | 'not_paired';
  adsl_address?: string;                // ICAO address being transmitted
  adsl_address_type?: number;           // Address type (1=ICAO, 3=FLARM)
  adsl_aircraft_type?: number;          // Aircraft type code
  battery_capacity?: number;            // Battery level (0-100)
  gps_altitude?: number;                // GPS altitude in meters
  gps_latitude?: number;                // GPS latitude
  gps_longitude?: number;               // GPS longitude
  gps_satellites?: number;              // Number of GPS satellites
  gps_fix?: number;                     // GPS fix status (0=no fix, 2=3D fix)
  aircraft_lte_count?: number;          // Aircraft detected via cellular
  aircraft_air_count?: number;          // Aircraft detected via radio
  modem_apn?: string;                   // Cellular APN
  modem_apn_password?: string;          // Cellular APN password
  modem_apn_username?: string;          // Cellular APN username
  modem_operator?: string;              // Mobile network operator name
  modem_pin?: string;                   // SIM PIN
  modem_rsii?: number;                  // Cellular signal strength (0-100, inverted)
  modem_imei?: any;                     // Device IMEI
  modem_iccid?: any;                    // SIM card ICCID
  safesky_uid?: string;                 // SafeSky user ID
  version?: string;                     // Firmware version
  model_chip?: string;                  // Hardware model/chip info
  highlight_safesky_traffic?: string;   // Traffic highlighting setting
  wifi_name?: string;                   // WiFi network name
  wifi_pass?: string;                   // WiFi password
}

Getting Device Status

Subscribe to the Aero-Tracker proprietary service to automatically receive status updates:

Required Service & Characteristic:

  • Service UUID: 3F6AECC7-5406-47AB-9A75-0F5CF12EAF8E
  • RX Characteristic (Notify): E8A6196B-2B02-4EFE-ADC7-6702CBBA3605
let statusBuffer = '';

// Subscribe to status updates
const subscription = bluetoothLE.subscribe({
  address: deviceAddress,
  service: '3F6AECC7-5406-47AB-9A75-0F5CF12EAF8E',
  characteristic: 'E8A6196B-2B02-4EFE-ADC7-6702CBBA3605'
}).subscribe(data => {
  const chunk = bluetoothLE.bytesToString(
    bluetoothLE.encodedStringToBytes(data.value)
  );
  
  statusBuffer += chunk;
  
  // Check for complete status message
  if (statusBuffer.includes('##END##')) {
    const jsonData = statusBuffer.replace('##END##', '');
    
    try {
      const status = JSON.parse(jsonData);
      handleDeviceStatus(status);
    } catch (error) {
      console.error('Failed to parse status JSON:', error);
    }
    
    statusBuffer = ''; // Reset buffer for next message
  }
});

Processing Status Updates

function handleDeviceStatus(status: MyDeviceStatus) {
  // Battery level (already as percentage 0-100)
  const batteryLevel = status.battery_capacity || 0;
  
  // Signal strength (inverted and normalized to 0-100)
  const signalStrength = 100 - (status.modem_rsii || 100);
  
  // Clean up operator name (remove duplicates)
  const operatorName = (status.modem_operator || '')
    .replace(/(\b\w+\b)(?=.*\b\1\b)/ig, '')
    .trimStart();
  
  // GPS status
  const hasGpsFix = status.gps_fix === 2;
  
  console.log('Device Status:', {
    id: status.id,
    battery: `${batteryLevel}%`,
    signal: `${signalStrength}%`,
    operator: operatorName,
    gps: hasGpsFix ? 'Fixed' : 'No Fix',
    satellites: status.gps_satellites || 0,
    firmware: status.version,
    broadcasting: status.adsl_address,
    aircraftDetected: {
      cellular: status.aircraft_lte_count || 0,
      radio: status.aircraft_air_count || 0
    }
  });
}

Status Update Frequency

  • Status messages are automatically sent every few seconds while connected
  • No commands need to be sent to receive status updates
  • The device will continuously broadcast its current state
  • Status updates include both static info (firmware version, device ID) and dynamic data (battery, GPS, signal strength)
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