speeding up HCE

app/src/main/java/com/github/nacabaro/vbhelper/screens/scanScreen/converters/FromNfcConverter.kt

@@ -3,6 +3,7 @@ package com.github.nacabaro.vbhelper.screens.scanScreen.converters
 import androidx.activity.ComponentActivity
 import com.github.cfogrady.vbnfc.be.BENfcCharacter
 import com.github.cfogrady.vbnfc.data.NfcCharacter
+import com.github.cfogrady.vbnfc.vb.SpecialMission
 import com.github.cfogrady.vbnfc.vb.VBNfcCharacter
 import com.github.nacabaro.vbhelper.di.VBHelper
 import com.github.nacabaro.vbhelper.domain.card.Card
@@ -268,8 +269,8 @@ class FromNfcConverter (
             SpecialMissions(
                 characterId = characterId,
                 watchId = watchId,
-                missionType = com.github.cfogrady.vbnfc.data.MissionType.NONE,
-                status = com.github.cfogrady.vbnfc.data.MissionStatus.UNAVAILABLE,
+                missionType = SpecialMission.Type.NONE,
+                status = SpecialMission.Status.UNAVAILABLE,
                 goal = 0,
                 progress = 0,
                 timeElapsedInMinutes = 0,

app/src/main/java/com/github/nacabaro/vbhelper/transfer/hce/VitalWearHceReaderClient.kt

@@ -1,5 +1,6 @@
 package com.github.nacabaro.vbhelper.transfer.hce
 import android.nfc.tech.IsoDep
+import android.os.SystemClock
 import android.util.Log
 import com.github.cfogrady.vitalwear.protos.Character
 import kotlinx.coroutines.delay
@@ -8,7 +9,15 @@ import kotlinx.coroutines.runBlocking
  * Phone-side ISO-DEP client that drives the VitalWear HCE session.
  * Mirrors the APDU protocol defined in VitalWearHceProtocol on the watch.
  */
-class VitalWearHceReaderClient(private val isoDep: IsoDep) {
+class VitalWearHceReaderClient(
+    private val isoDep: IsoDep,
+    private val fastMode: Boolean = true,
+) {
+    companion object {
+        private const val MIN_CHUNK_SIZE = 256
+        private val bestChunkByDevice = linkedMapOf<String, Int>()
+    }
+
     init {
         // Import + DB writes can make COMMIT slower than default transceive time on some devices.
         isoDep.timeout = 10_000
@@ -32,78 +41,182 @@ class VitalWearHceReaderClient(private val isoDep: IsoDep) {
     private val STATUS_SUCCESS: Byte = 0x04
     private val STATUS_FAILURE: Byte = 0x05
     private val STATUS_SYNCING: Byte = 0x03
+    private val STATUS_ARMED_SEND: Byte = 0x01
+    private val STATUS_ARMED_RECEIVE: Byte = 0x02
+    private val STATUS_IDLE: Byte = 0x00
+    private val CONFIRMATION_MAX_POLLS = 84 // ~21s with adaptive delay schedule
+    private val PREFERRED_MAX_CHUNK_SIZE = 2048
+    // Fast mode is the default; ceremony APDUs are only enabled when fastMode is false.
+    private val ENABLE_TRANSFER_CEREMONY = !fastMode
+
+    private data class ReadPayloadResult(
+        val character: Character,
+        val session: VitalWearHceSessionInfo,
+    )
+
+    private data class HceTransferMetrics(
+        val direction: String,
+        val payloadBytes: Int,
+        val negotiatedChunkBytes: Int,
+        val apduCountTotal: Int,
+        val apduCountData: Int,
+        val statusPollCount: Int,
+        val tSelectNegotiateMs: Long,
+        val tChunkLoopMs: Long,
+        val tCommitAckMs: Long,
+        val tConfirmMs: Long,
+        val tTotalMs: Long,
+        val result: String,
+    ) {
+        fun log() {
+            Log.i(
+                "HCE_CLIENT_METRICS",
+                "dir=$direction payloadBytes=$payloadBytes chunk=$negotiatedChunkBytes apduTotal=$apduCountTotal " +
+                    "apduData=$apduCountData polls=$statusPollCount selectNegotiateMs=$tSelectNegotiateMs " +
+                    "chunkLoopMs=$tChunkLoopMs commitAckMs=$tCommitAckMs confirmMs=$tConfirmMs totalMs=$tTotalMs result=$result"
+            )
+        }
+    }
 
     /** MOVE READ: read character bytes first, let caller import/validate, then COMMIT only on success.
      * If [onCharacterRead] returns false, COMMIT is skipped so source can remain on the watch.
      */
     fun moveCharacterFromWatch(onCharacterRead: (Character) -> Boolean): Boolean {
-        val character = readCharacterFromWatchWithoutCommit()
-        if (!onCharacterRead(character)) {
+        val readResult = readCharacterFromWatchWithoutCommit()
+        if (!onCharacterRead(readResult.character)) {
             return false
         }
+        if (!readResult.session.canCommit()) {
+            error("Session does not allow COMMIT for watch->phone transfer")
+        }
         requireOk(sendApdu(INS_COMMIT, byteArrayOf()), "COMMIT")
         return true
     }
 
     /** READ: watch has called armSend() — phone reads the character off the watch. */
     fun receiveCharacterFromWatch(): Character {
-        val character = readCharacterFromWatchWithoutCommit()
+        val readResult = readCharacterFromWatchWithoutCommit()
+        if (!readResult.session.canCommit()) {
+            error("Session does not allow COMMIT for watch->phone transfer")
+        }
         requireOk(sendApdu(INS_COMMIT, byteArrayOf()), "COMMIT")
-        return character
+        return readResult.character
     }
 
-    private fun readCharacterFromWatchWithoutCommit(): Character {
+    private fun readCharacterFromWatchWithoutCommit(): ReadPayloadResult {
+        val transferStartMs = SystemClock.elapsedRealtime()
+        var apduCount = 0
+        var dataApduCount = 0
         selectAid()
-        val negResponse = sendApdu(INS_NEGOTIATE, byteArrayOf(MODE_WATCH_TO_PHONE, VERSION))
-        requireOk(negResponse, "NEGOTIATE")
-        val maxChunk = ((negResponse[2].toInt() and 0xFF) shl 8) or (negResponse[3].toInt() and 0xFF)
-        val payloadLen =
-            ((negResponse[4].toInt() and 0xFF) shl 24) or
-            ((negResponse[5].toInt() and 0xFF) shl 16) or
-            ((negResponse[6].toInt() and 0xFF) shl 8) or
-            (negResponse[7].toInt() and 0xFF)
-        Log.d("HCE_CLIENT", "Receiving $payloadLen bytes in chunks of $maxChunk")
-        val payload = ByteArray(payloadLen)
+        apduCount++
+        val session = negotiateSession(MODE_WATCH_TO_PHONE, desiredMaxChunkSize())
+        apduCount++
+        val negotiatedMs = SystemClock.elapsedRealtime()
+        check(session.isWatchToPhone()) { "NEGOTIATE direction mismatch for WATCH_TO_PHONE" }
+        Log.d("HCE_CLIENT", "Receiving ${session.payloadLength} bytes in chunks of ${session.maxChunkSize}")
+        val payload = ByteArray(session.payloadLength)
         var offset = 0
-        while (offset < payloadLen) {
+        while (offset < session.payloadLength) {
             val chunkResponse = sendApdu(INS_READ_CHUNK, intToBytes(offset))
+            apduCount++
+            dataApduCount++
             requireOk(chunkResponse, "READ_CHUNK @ $offset")
             val chunkData = chunkResponse.dropLast(2).toByteArray()
             chunkData.copyInto(payload, offset)
             offset += chunkData.size
         }
-        return Character.parseFrom(payload)
+        val chunksDoneMs = SystemClock.elapsedRealtime()
+        HceTransferMetrics(
+            direction = "WATCH_TO_PHONE_READ",
+            payloadBytes = payload.size,
+            negotiatedChunkBytes = session.maxChunkSize,
+            apduCountTotal = apduCount,
+            apduCountData = dataApduCount,
+            statusPollCount = 0,
+            tSelectNegotiateMs = negotiatedMs - transferStartMs,
+            tChunkLoopMs = chunksDoneMs - negotiatedMs,
+            tCommitAckMs = 0L,
+            tConfirmMs = 0L,
+            tTotalMs = chunksDoneMs - transferStartMs,
+            result = "read_complete",
+        ).log()
+        return ReadPayloadResult(
+            character = Character.parseFrom(payload),
+            session = session,
+        )
     }
 
     /** WRITE: watch has called armReceive() — phone pushes a character to the watch. */
     fun sendCharacterToWatch(character: Character, closeSyncUiAfterCommit: Boolean = true) {
+        val session = sendCharacterToWatchInternal(
+            character = character,
+            closeSyncUiAfterCommit = closeSyncUiAfterCommit,
+            requestedChunkSize = desiredMaxChunkSize(),
+        )
+        rememberBestChunk(session.maxChunkSize)
+    }
+
+    private fun sendCharacterToWatchInternal(
+        character: Character,
+        closeSyncUiAfterCommit: Boolean,
+        requestedChunkSize: Int,
+    ): VitalWearHceSessionInfo {
+        val transferStartMs = SystemClock.elapsedRealtime()
+        var apduCount = 0
+        var dataApduCount = 0
         selectAid()
-        
-        // --- True to Toy Ceremony ---
-        // 1. Haptic Lock-on
+        apduCount++
+        if (ENABLE_TRANSFER_CEREMONY) {
+            // Optional toy-like ceremony; kept behind a toggle to avoid transfer overhead.
             sendApdu(INS_VIBRATE, byteArrayOf())
-        
-        // 2. Visual Sync (Start Beam)
+            apduCount++
             sendApdu(INS_SYNC_UI, byteArrayOf(0x01))
+            apduCount++
+        }
 
         val payload = character.toByteArray()
-        val negResponse = sendApdu(INS_NEGOTIATE, byteArrayOf(MODE_PHONE_TO_WATCH, VERSION))
-        requireOk(negResponse, "NEGOTIATE")
-        val maxChunk = ((negResponse[2].toInt() and 0xFF) shl 8) or (negResponse[3].toInt() and 0xFF)
-        Log.d("HCE_CLIENT", "Sending ${payload.size} bytes in chunks of $maxChunk")
+        val session = negotiateSession(MODE_PHONE_TO_WATCH, requestedChunkSize)
+        apduCount++
+        val negotiatedMs = SystemClock.elapsedRealtime()
+        check(session.isPhoneToWatch()) { "NEGOTIATE direction mismatch for PHONE_TO_WATCH" }
+        Log.d("HCE_CLIENT", "Sending ${payload.size} bytes in chunks of ${session.maxChunkSize}")
         var offset = 0
         while (offset < payload.size) {
-            val chunkEnd = (offset + maxChunk).coerceAtMost(payload.size)
+            val chunkEnd = (offset + session.maxChunkSize).coerceAtMost(payload.size)
             val chunk = payload.copyOfRange(offset, chunkEnd)
             requireOk(sendApdu(INS_WRITE_CHUNK, intToBytes(offset) + chunk), "WRITE_CHUNK @ $offset")
+            apduCount++
+            dataApduCount++
             offset = chunkEnd
         }
-        requireOk(sendApdu(INS_COMMIT, byteArrayOf()), "COMMIT")
-        
-        // 3. Visual Sync (End Beam)
-        if (closeSyncUiAfterCommit) {
-            sendApdu(INS_SYNC_UI, byteArrayOf(0x00))
+        val chunksDoneMs = SystemClock.elapsedRealtime()
+        if (!session.canCommit()) {
+            error("Session does not allow COMMIT for phone->watch transfer")
         }
+        val commitStartMs = SystemClock.elapsedRealtime()
+        requireOk(sendApdu(INS_COMMIT, byteArrayOf()), "COMMIT")
+        apduCount++
+        val commitDoneMs = SystemClock.elapsedRealtime()
+
+        if (ENABLE_TRANSFER_CEREMONY && closeSyncUiAfterCommit) {
+            sendApdu(INS_SYNC_UI, byteArrayOf(0x00))
+            apduCount++
+        }
+        HceTransferMetrics(
+            direction = "PHONE_TO_WATCH_WRITE",
+            payloadBytes = payload.size,
+            negotiatedChunkBytes = session.maxChunkSize,
+            apduCountTotal = apduCount,
+            apduCountData = dataApduCount,
+            statusPollCount = 0,
+            tSelectNegotiateMs = negotiatedMs - transferStartMs,
+            tChunkLoopMs = chunksDoneMs - negotiatedMs,
+            tCommitAckMs = commitDoneMs - commitStartMs,
+            tConfirmMs = 0L,
+            tTotalMs = commitDoneMs - transferStartMs,
+            result = "commit_acked",
+        ).log()
+        return session
     }
 
     /**
@@ -111,28 +224,87 @@ class VitalWearHceReaderClient(private val isoDep: IsoDep) {
      * Returns true only when the watch reports import success.
      */
     fun sendCharacterToWatchAndConfirm(character: Character): Boolean {
-        sendCharacterToWatch(character, closeSyncUiAfterCommit = false)
+        var lastError: Exception? = null
+        for (candidateChunk in chunkCandidates()) {
+            val confirmStartMs = SystemClock.elapsedRealtime()
+            val session = try {
+                sendCharacterToWatchInternal(
+                    character = character,
+                    closeSyncUiAfterCommit = false,
+                    requestedChunkSize = candidateChunk,
+                )
+            } catch (e: Exception) {
+                lastError = e
+                Log.w("HCE_CLIENT", "Chunk attempt failed before confirmation at chunk=$candidateChunk", e)
+                continue
+            }
+            if (!session.canPollStatus()) {
+                return false
+            }
+            var polls = 0
+            var apduCount = 0
+            var result = "timeout"
             val confirmed = runBlocking {
-            repeat(12) {
+                repeat(CONFIRMATION_MAX_POLLS) {
                     val statusResponse = sendApdu(INS_STATUS, byteArrayOf())
+                    apduCount++
+                    polls++
                     requireOk(statusResponse, "STATUS")
                     val statusByte = statusResponse.dropLast(2).firstOrNull()
                     Log.d("HCE_CLIENT", "STATUS poll[$it]: statusByte=${statusByte?.toInt()?.and(0xFF)}")
                     if (statusByte == STATUS_SUCCESS) {
+                        result = "success"
                         return@runBlocking true
                     }
                     if (statusByte == STATUS_FAILURE) {
+                        result = "failure"
                         return@runBlocking false
                     }
-                delay(250)
+                    if (
+                        statusByte == STATUS_SYNCING ||
+                        statusByte == STATUS_ARMED_RECEIVE ||
+                        statusByte == STATUS_ARMED_SEND ||
+                        statusByte == STATUS_IDLE
+                    ) {
+                        delay(delayForPoll(it))
+                        return@repeat
+                    }
+                    // Unknown status byte: keep waiting briefly instead of failing early.
+                    delay(delayForPoll(it))
                 }
                 false
             }
+            if (ENABLE_TRANSFER_CEREMONY) {
                 // End the sync UI after we have consumed terminal status.
                 runCatching {
                     sendApdu(INS_SYNC_UI, byteArrayOf(0x00))
                 }
-        return confirmed
+            }
+            HceTransferMetrics(
+                direction = "PHONE_TO_WATCH_CONFIRM",
+                payloadBytes = character.serializedSize,
+                negotiatedChunkBytes = session.maxChunkSize,
+                apduCountTotal = apduCount,
+                apduCountData = 0,
+                statusPollCount = polls,
+                tSelectNegotiateMs = 0L,
+                tChunkLoopMs = 0L,
+                tCommitAckMs = 0L,
+                tConfirmMs = SystemClock.elapsedRealtime() - confirmStartMs,
+                tTotalMs = SystemClock.elapsedRealtime() - confirmStartMs,
+                result = "$result(requested=$candidateChunk)",
+            ).log()
+            if (confirmed) {
+                rememberBestChunk(session.maxChunkSize)
+                return true
+            }
+            // Explicit failure means import rejected payload; retrying chunk size won't help.
+            if (result == "failure") {
+                return false
+            }
+        }
+        lastError?.let { throw it }
+        return false
     }
 
     /**
@@ -141,9 +313,8 @@ class VitalWearHceReaderClient(private val isoDep: IsoDep) {
      */
     fun verifyWatchReadyToReceive(): Boolean {
         selectAid()
-        val negResponse = sendApdu(INS_NEGOTIATE, byteArrayOf(MODE_PHONE_TO_WATCH, VERSION))
-        requireOk(negResponse, "NEGOTIATE")
-        return true
+        val session = negotiateSession(MODE_PHONE_TO_WATCH, desiredMaxChunkSize())
+        return session.canCommit()
     }
 
     private fun selectAid() {
@@ -152,9 +323,102 @@ class VitalWearHceReaderClient(private val isoDep: IsoDep) {
         if (statusWord(response) != SW_OK) error("SELECT AID failed: ${response.toHex()}")
     }
     private fun sendApdu(ins: Byte, data: ByteArray): ByteArray {
-        val apdu = byteArrayOf(CLA, ins, 0x00, 0x00, data.size.toByte()) + data
+        val apdu = if (data.size <= 0xFF) {
+            byteArrayOf(CLA, ins, 0x00, 0x00, data.size.toByte()) + data
+        } else {
+            byteArrayOf(
+                CLA,
+                ins,
+                0x00,
+                0x00,
+                0x00,
+                ((data.size ushr 8) and 0xFF).toByte(),
+                (data.size and 0xFF).toByte(),
+            ) + data
+        }
         return isoDep.transceive(apdu)
     }
+
+    private fun negotiateSession(mode: Byte, requestedChunkSize: Int): VitalWearHceSessionInfo {
+        val negResponse = sendApdu(
+            INS_NEGOTIATE,
+            byteArrayOf(mode, VERSION) + intToShortBytes(requestedChunkSize)
+        )
+        requireOk(negResponse, "NEGOTIATE")
+        val negotiatedMode = when (negResponse[1]) {
+            MODE_WATCH_TO_PHONE -> VitalWearHceTransferDirection.WATCH_TO_PHONE
+            MODE_PHONE_TO_WATCH -> VitalWearHceTransferDirection.PHONE_TO_WATCH
+            else -> error("NEGOTIATE returned unknown direction: ${negResponse[1]}")
+        }
+        val maxChunk = ((negResponse[2].toInt() and 0xFF) shl 8) or (negResponse[3].toInt() and 0xFF)
+        val payloadLen =
+            ((negResponse[4].toInt() and 0xFF) shl 24) or
+            ((negResponse[5].toInt() and 0xFF) shl 16) or
+            ((negResponse[6].toInt() and 0xFF) shl 8) or
+            (negResponse[7].toInt() and 0xFF)
+        return VitalWearHceSession(
+            direction = negotiatedMode,
+            maxChunkSize = maxChunk,
+            payloadLength = payloadLen,
+        )
+    }
+
+    private fun desiredMaxChunkSize(): Int {
+        val transceiveLimit = runCatching { isoDep.maxTransceiveLength }.getOrNull()
+        val maxByDevice = if (transceiveLimit != null && transceiveLimit > 0) {
+            // Extended APDU write overhead: 7-byte header + 4-byte offset.
+            (transceiveLimit - 11).coerceAtLeast(1)
+        } else {
+            PREFERRED_MAX_CHUNK_SIZE
+        }
+        val cappedByDevice = maxByDevice.coerceAtMost(PREFERRED_MAX_CHUNK_SIZE)
+        val cachedBest = cachedBestChunk()
+        return if (cachedBest == null) {
+            cappedByDevice
+        } else {
+            cachedBest.coerceIn(MIN_CHUNK_SIZE, cappedByDevice)
+        }
+    }
+
+    private fun chunkCandidates(): List<Int> {
+        val maxChunk = desiredMaxChunkSize()
+        val baselineCandidates = listOf(maxChunk, 2048, 1536, 1024, 768, 512, MIN_CHUNK_SIZE)
+        return baselineCandidates
+            .map { it.coerceAtMost(maxChunk) }
+            .filter { it in MIN_CHUNK_SIZE..maxChunk }
+            .distinct()
+    }
+
+    private fun deviceKey(): String {
+        val tagId = isoDep.tag?.id ?: return "unknown-device"
+        return tagId.toHex()
+    }
+
+    private fun cachedBestChunk(): Int? {
+        synchronized(bestChunkByDevice) {
+            return bestChunkByDevice[deviceKey()]
+        }
+    }
+
+    private fun rememberBestChunk(chunkSize: Int) {
+        synchronized(bestChunkByDevice) {
+            bestChunkByDevice[deviceKey()] = chunkSize
+        }
+    }
+
+    private fun delayForPoll(pollIndex: Int): Long {
+        return when {
+            pollIndex < 20 -> 80L
+            pollIndex < 56 -> 175L
+            else -> 300L
+        }
+    }
+
+    private fun intToShortBytes(value: Int): ByteArray = byteArrayOf(
+        ((value ushr 8) and 0xFF).toByte(),
+        (value and 0xFF).toByte()
+    )
+
     private fun requireOk(response: ByteArray, context: String) {
         if (statusWord(response) != SW_OK) error("$context failed: ${response.toHex()}")
     }

app/src/main/java/com/github/nacabaro/vbhelper/transfer/hce/VitalWearHceSession.kt

@@ -0,0 +1,40 @@
+package com.github.nacabaro.vbhelper.transfer.hce
+
+internal enum class VitalWearHceTransferDirection {
+    WATCH_TO_PHONE,
+    PHONE_TO_WATCH,
+}
+
+internal interface VitalWearHceSessionInfo {
+    val direction: VitalWearHceTransferDirection
+    val maxChunkSize: Int
+    val payloadLength: Int
+
+    fun isWatchToPhone(): Boolean {
+        return direction == VitalWearHceTransferDirection.WATCH_TO_PHONE
+    }
+
+    fun isPhoneToWatch(): Boolean {
+        return direction == VitalWearHceTransferDirection.PHONE_TO_WATCH
+    }
+
+    fun canCommit(): Boolean {
+        return true
+    }
+
+    fun canPollStatus(): Boolean {
+        // Import confirmation polling only applies for phone->watch transfers.
+        return isPhoneToWatch()
+    }
+}
+
+internal data class VitalWearHceSession(
+    override val direction: VitalWearHceTransferDirection,
+    override val maxChunkSize: Int,
+    override val payloadLength: Int,
+) : VitalWearHceSessionInfo
+
+
+
+
+