chore: Initial commit

1 files changed, 121 insertions, 0 deletions

diff --git a/app/src/main/java/com/arslaancodes/zwznfreefit/BleManager.kt b/app/src/main/java/com/arslaancodes/zwznfreefit/BleManager.kt
new file mode 100644
index 0000000..c138ead
--- /dev/null
+++ b/app/src/main/java/com/arslaancodes/zwznfreefit/BleManager.kt
@@ -0,0 +1,121 @@
+package com.arslaancodes.zwznfreefit
+
+import android.bluetooth.*
+import android.bluetooth.le.*
+import android.content.Context
+import android.os.ParcelUuid
+import java.util.UUID
+
+val SERVICE_UUID = UUID.fromString("6E40FC00-B5A3-F393-E0A9-E50E24DCCA9E")
+val WRITE_UUID   = UUID.fromString("6E40FC20-B5A3-F393-E0A9-E50E24DCCA9E")
+val NOTIFY_UUID  = UUID.fromString("6E40FC21-B5A3-F393-E0A9-E50E24DCCA9E")
+
+class BleManager(private val context: Context) {
+	companion object {
+		lateinit var instance: BleManager
+	}
+
+	init {
+		instance = this
+	}
+
+	private val adapter = BluetoothAdapter.getDefaultAdapter()
+	private var gatt: BluetoothGatt? = null
+	private var onNotify: ((ByteArray) -> Unit)? = null
+
+	fun scan(onFound: (BluetoothDevice) -> Unit) {
+		val scanner = adapter.bluetoothLeScanner
+		android.util.Log.d("BLE", "Starting scan, scanner=$scanner")
+		if (scanner == null) {
+			android.util.Log.e("BLE", "Scanner is null! Bluetooth off?")
+			return
+		}
+		val settings = ScanSettings.Builder().build()
+		scanner.startScan(null, settings, object : ScanCallback() {
+			override fun onScanResult(callbackType: Int, result: ScanResult) {
+				android.util.Log.d("BLE", "Found: ${result.device.name} ${result.device.address}")
+				onFound(result.device)
+			}
+			override fun onScanFailed(errorCode: Int) {
+				android.util.Log.e("BLE", "Scan failed: $errorCode")
+			}
+		})
+	}
+
+	fun connect(device: BluetoothDevice, onConnected: (BluetoothGatt) -> Unit) {
+		gatt = device.connectGatt(context, false, object : BluetoothGattCallback() {
+			override fun onConnectionStateChange(g: BluetoothGatt, status: Int, newState: Int) {
+				if (newState == BluetoothProfile.STATE_CONNECTED) {
+					g.discoverServices()
+				}
+			}
+			override fun onServicesDiscovered(g: BluetoothGatt, status: Int) {
+				val notifyChar = g.getService(SERVICE_UUID)?.getCharacteristic(NOTIFY_UUID)
+				if (notifyChar != null) {
+					g.setCharacteristicNotification(notifyChar, true)
+					val descriptor = notifyChar.getDescriptor(
+						UUID.fromString("00002902-0000-1000-8000-00805f9b34fb")
+					)
+					descriptor?.value = BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE
+					g.writeDescriptor(descriptor)
+				}
+				onConnected(g)
+			}
+			override fun onCharacteristicChanged(g: BluetoothGatt, characteristic: BluetoothGattCharacteristic) {
+				if (characteristic.uuid == NOTIFY_UUID) {
+					onNotify?.invoke(characteristic.value)
+				}
+			}
+		})
+	}
+
+	fun write(data: ByteArray) {
+		val char = gatt?.getService(SERVICE_UUID)?.getCharacteristic(WRITE_UUID)
+		char?.value = data
+		gatt?.writeCharacteristic(char)
+	}
+
+	fun syncTime() {
+		val now = System.currentTimeMillis() / 1000
+		val tzOffset = java.util.TimeZone.getDefault().getOffset(System.currentTimeMillis()) / 1000
+
+		val packet = ByteArray(12)
+		packet[0] = 0x01
+		packet[1] = (now shr 24).toByte()
+		packet[2] = (now shr 16).toByte()
+		packet[3] = (now shr 8).toByte()
+		packet[4] = now.toByte()
+		packet[5] = (tzOffset shr 24).toByte()
+		packet[6] = (tzOffset shr 16).toByte()
+		packet[7] = (tzOffset shr 8).toByte()
+		packet[8] = tzOffset.toByte()
+		packet[9] = 0x00
+		packet[10] = 0x00 // language code, 0 = english
+		packet[11] = 0x00
+
+		write(packet)
+	}
+
+	fun switchFindBand(flag: Int) {
+		// find/vibrate band 
+		// these functions are usually named after their freefit/ferefit counterparts
+		val packet = ByteArray(2)
+		packet[0] = 0x51 // command
+		packet[1] = flag.toByte() // 0x01 = start, 0x00 = stop
+		write(packet)
+	}
+
+	fun configRealTimeMeasure(type: Int, start: Boolean, onResult: (ByteArray) -> Unit) {
+		// measure heart rate/other stuff
+		// confirmed working types so far is just 0x00 for heart rate, will RE more later
+		// yet again, function named after freefit counterparts from RE'd protocol/decompiled APKs
+		// all code in this file is intellectual property of Arslaan Pathan, no pieces of decompiled freefit code have been used anywhere in the app
+		// freefit decompilation was merely used as a reference for reverse-engineering the protocol
+		onNotify = onResult
+		val packet = ByteArray(3)
+		packet[0] = 0x60.toByte()
+		packet[1] = type.toByte()
+		packet[2] = if (start) 0x01.toByte() else 0x00.toByte()
+		write(packet)
+	}
+}