Koha ILS RFID Handheld Middleware | Android Shelf-Reader & Sync

package com.rfidsoftwares.chainway.middleware

import android.app.Service
import android.view.KeyEvent
import com.rscja.deviceapi.RFIDWithUHFUART
import kotlinx.coroutines.*
import kotlinx.coroutines.flow.MutableSharedFlow

class ChainwayRfidService : Service() {
    private var uhfReader: RFIDWithUHFUART? = null
    private val tagFlow = MutableSharedFlow<String>(replay = 0)
    private val serviceScope = CoroutineScope(Dispatchers.IO + SupervisorJob())

    override fun onCreate() {
        super.onCreate()
        // Initialize JNI serial UART driver on /dev/ttyMT2
        uhfReader = RFIDWithUHFUART.getInstance().apply {
            init()
            setPower(30) // 30 dBm maximum sensitivity for dense scanning
        }
    }

    // Direct hardware trigger KeyCode 139 capture (bypasses Android KeyboardEmulator)
    fun onHardwareTrigger(keyCode: Int, isDown: Boolean): Boolean {
        if (keyCode == 139 || keyCode == 280) {
            if (isDown) startContinuousInventory()
            else stopContinuousInventory()
            return true
        }
        return false
    }

    private fun startContinuousInventory() {
        serviceScope.launch {
            uhfReader?.startInventoryTag()
            while (isActive) {
                val tag = uhfReader?.readTagFromBuffer() ?: continue
                tagFlow.emit(tag.epc)
            }
        }
    }

    override fun onDestroy() {
        // CRITICAL: Explicitly release serial UART port to prevent OS deadlocks on restart
        uhfReader?.free()
        serviceScope.cancel()
        super.onDestroy()
    }
}