Update flysight2 protocol for 2024.11.11 release candidate

Author: platypii

build.gradle

@@ -6,7 +6,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:8.7.2'
+        classpath 'com.android.tools.build:gradle:8.7.3'
         classpath 'com.google.firebase:firebase-crashlytics-gradle:3.0.2'
         classpath 'com.google.gms:google-services:4.4.2'
 

common/src/main/java/com/platypii/baseline/bluetooth/Flysight2Protocol.java

@@ -12,8 +12,10 @@
 import androidx.annotation.Nullable;
 import com.welie.blessed.BluetoothPeripheral;
 import com.welie.blessed.GattStatus;
+import com.welie.blessed.WriteType;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
+import java.util.Arrays;
 import java.util.UUID;
 
 public class Flysight2Protocol extends BleProtocol {
@@ -24,11 +26,15 @@ public class Flysight2Protocol extends BleProtocol {
     private static final UUID flysightService0 = UUID.fromString("00000000-cc7a-482a-984a-7f2ed5b3e58f");
     private static final UUID flysightService1 = UUID.fromString("00000001-cc7a-482a-984a-7f2ed5b3e58f");
     private static final UUID flysightService2 = UUID.fromString("00000002-cc7a-482a-984a-7f2ed5b3e58f");
+
     // Flysight characteristics
     private static final UUID flysightCharacteristicGNSS = UUID.fromString("00000000-8e22-4541-9d4c-21edae82ed19");
     private static final UUID flysightCharacteristicTX = UUID.fromString("00000001-8e22-4541-9d4c-21edae82ed19");
     private static final UUID flysightCharacteristicRX = UUID.fromString("00000002-8e22-4541-9d4c-21edae82ed19");
 
+    // Flysight commands
+    private static final byte[] flysightCommandHeartbeat = new byte[]{(byte) 0xfe};
+
     private static final long gpsEpochMilliseconds = 315964800000L - 18000L; // January 6, 1980 - 18s
     private static final long millisecondsPerWeek = 604800000L;
 
@@ -46,6 +52,8 @@ public boolean canParse(@NonNull BluetoothPeripheral peripheral, @Nullable ScanR
     public void onServicesDiscovered(@NonNull BluetoothPeripheral peripheral) {
         Log.i(TAG, "flysight services discovered " + peripheral.getCurrentMtu());
         peripheral.requestMtu(256);
+        // Start heartbeat thread
+        startHeartbeat(peripheral, flysightService0, flysightCharacteristicRX);
     }
 
     @Override
@@ -58,6 +66,10 @@ public void onMtuChanged(@NonNull BluetoothPeripheral peripheral, int mtu, @NonN
     @Override
     public void processBytes(@NonNull BluetoothPeripheral peripheral, @NonNull byte[] value) {
         try {
+            // FlySight2 RC pre-2024-11-11 didn't have flag byte
+            if (value.length == 29 && value[0] == -80) { // 0xb0
+                value = Arrays.copyOfRange(value, 1, value.length);
+            }
             final ByteBuffer buf = ByteBuffer.wrap(value).order(ByteOrder.LITTLE_ENDIAN);
             final int tow = buf.getInt(0); // gps time of week
             final double lng = buf.getInt(4) * 1e-7;
@@ -92,4 +104,23 @@ public void processBytes(@NonNull BluetoothPeripheral peripheral, @NonNull byte[
             Exceptions.report(e);
         }
     }
+
+    private void startHeartbeat(@NonNull BluetoothPeripheral peripheral, @NonNull UUID service, @NonNull UUID characteristic) {
+        // Start heartbeat thread
+        new Thread(() -> {
+            try {
+                while (true) {
+                    // Send heartbeat every 14.5 seconds
+                    if (peripheral.writeCharacteristic(service, characteristic, flysightCommandHeartbeat, WriteType.WITHOUT_RESPONSE)) {
+                        Thread.sleep(14500);
+                    } else {
+                        Log.w(TAG, "Failed to send heartbeat, stopping heartbeat thread");
+                        break;
+                    }
+                }
+            } catch (InterruptedException e) {
+                Log.i(TAG, "Heartbeat thread interrupted");
+            }
+        }).start();
+    }
 }