fix: critical issues from code review

- Fix README touch sensor docs (active LOW, INPUT_PULLUP)
- Fix README LED pin (G46 -> G35 WS2812)
- Fix release.sh to copy server/ and client/ firmware
- Remove stale firmware.bin from root assets
- Reduce OTA START wait from 10s to 500ms
- Close bluetoothGatt before new connection
- Use kotlinx.coroutines.CompletableDeferred

android/app/src/main/java/nl/eddydevink/sylda/BleRelayManager.kt

@@ -32,6 +32,7 @@ import javax.crypto.Mac
 import javax.crypto.spec.GCMParameterSpec
 import javax.crypto.spec.SecretKeySpec
 import kotlin.text.Charsets
+import kotlinx.coroutines.CompletableDeferred
 
 class BleRelayManager(
     private val context: Context,
@@ -83,14 +84,6 @@ class BleRelayManager(
     private var ecdhNotifyBuf: ByteArray = ByteArray(0)
     private var ecdhCccdPending = false
 
-    private class CompletableDeferred<T> {
-        private var result: T? = null
-        private var completed = false
-        @Synchronized fun complete(value: T) { result = value; completed = true }
-        @Synchronized fun isDone(): Boolean = completed
-        @Synchronized fun get(): T? = result
-    }
-
     interface OtaNotifyCallback {
         fun onOtaNotify(status: Int, seq: Int)
     }
@@ -290,6 +283,7 @@ class BleRelayManager(
     private fun connectToDevice(device: android.bluetooth.BluetoothDevice) {
         handler.post { callbacks.onStatusChanged(BleStatus.Connecting) }
         Log.d(TAG, "Connecting to ${device.address}")
+        bluetoothGatt?.close()
         bluetoothGatt = device.connectGatt(context, false, gattCallback)
     }
 
@@ -500,10 +494,10 @@ class BleRelayManager(
 
             Thread {
                 val start = System.currentTimeMillis()
-                while (!ecdhDeferred!!.isDone() && System.currentTimeMillis() - start < ECDH_TIMEOUT_MS) {
+                while (!ecdhDeferred!!.isCompleted && System.currentTimeMillis() - start < ECDH_TIMEOUT_MS) {
                     Thread.sleep(50)
                 }
-                if (!ecdhDeferred!!.isDone()) {
+                if (!ecdhDeferred!!.isCompleted) {
                     Log.w(TAG, "ECDH: notify timeout")
                     handler.post {
                         callbacks.onStatusChanged(BleStatus.CommError)

android/app/src/main/java/nl/eddydevink/sylda/OtaManager.kt

@@ -98,11 +98,7 @@ class OtaManager(
                 return@withContext false
             }
 
-            try {
-                withTimeout(OTA_START_TIMEOUT_MS) {
-                    while (true) { delay(100); ensureActive() }
-                }
-            } catch (_: kotlinx.coroutines.TimeoutCancellationException) {}
+            delay(500)
 
             val totalChunks = (fw.size + chunkDataSize - 1) / chunkDataSize
             var seq = 0