Android Mobile APK • Native JNI v3.4 Hardware: Chainway C72 / C71 (Impinj E710 / R2000)

Chainway C72 RFID Handheld Middleware: Android & Tally Sync

Deploy custom Android middleware for Chainway C72 and C71 UHF RFID handhelds. Real-time tag de-duplication, RSSI Geiger-counter locate mode, and automated Tally Prime, SAP, and REST API sync.

Tag Read Speed 750+ Tags/sec

ERP Sync Latency < 120 ms

Locate Accuracy RSSI Geiger +/- 10cm

Supported OS Android 11 / 13 / 14

Request Test APK & Android SDK Docs Schedule Architecture Review

ADB Handheld Sideload Command: Production Build v3.4.2

adb install -r rfidsoftwares-c72-handheld-middleware.apk

Chainway C72 Android

⚡ 30 dBm 📶 Wi-Fi 🔋 8000mAh

● CYCLE COUNT MODE SESSION S2 ACTIVE

Tags In Memory 1,842

JNI Rate 720/sec

EPC STREAM (HEX) RSSI

E2801160600002159841B9C4 -41 dBm

E2801160600002159841B9C5 -54 dBm

Backend Sync: 100% SYNCED

Live Handheld Simulator • Physical KeyCode 139 Intercept

Handheld Radio & Battery Engineering

Continuous 750+ Tag/s Inventory Scanning Without Android Freezes

Eliminate UI thread locks (ANRs), prevent serial port hangs, and enable acoustic Geiger proximity search in warehouse aisles.

GEIGER-COUNTER TAG LOCATE SIMULATOR Dynamic RSSI Radar

TARGET EPC TO PINPOINT: SKU #CW-72-9021

E2801160600002159841B9C4

0.4 m Distance

RSSI: -38 dBm (Strong Signal)

Acoustic Chirp: 2,400 Hz High-Pitch Pulse

Pinpoints misplaced inventory items or assets within ±10 cm.

Direct KeyCode 139 Hardware Trigger

Bypasses the buggy Android KeyboardEmulator driver entirely. Physical pistol trigger pulls are captured via low-level KeyEvents for instantaneous start/stop inventory without injecting ghost keystrokes into other inputs.

Offline SQLite WAL Cache & Auto-Sync

Deep warehouse aisles frequently drop Wi-Fi. All scanned tag events are cryptographically hashed and buffered into an encrypted local SQLite WAL database, streaming out to ERP backends the instant connection restores.

Geiger-Counter Proximity Locate Engine

Auditory tag-finder frequency scales in real time from 350 Hz to 2,800 Hz based on incoming RSSI signal strength (-75 dBm to -30 dBm), enabling operators to locate misplaced SKUs in seconds.

Developer Integration Guide

ChainwayRfidForegroundService.kt Implementation Guide

Inspect the production implementation code demonstrating non-blocking ingest, error recovery, and robust connection management.

ChainwayRfidForegroundService.kt

Android Studio / Kotlin

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()
    }
}

Engineering Comparison

Why Manufacturer Handheld Sample Apps Fail in Production

Generic sample code and basic scripts are designed for simple bench demonstrations, not multi-shift industrial production.

Problems with Default Chainway Demo Apps

✗ UART Port Deadlocks: Exiting the app without freeing the JNI port leaves /dev/ttyMT2 permanently locked until a hard battery pull.
✗ Android ANR Freezes: Running inventory loops on the UI thread causes total screen freezes when auditing racks with 5,000+ tags.
✗ KeyboardEmulator Collisions: Simulated keystrokes scramble barcode inputs and cause duplicate scans across form fields.
✗ Zero Offline Queuing: Losing Wi-Fi in cold rooms or back racking results in silent, unrecoverable data loss.

How Our Middleware Solves It

✓ Lifecycle-Safe Foreground Daemon: Foreground service intercepts onPause/onDestroy to guarantee clean serial port release every time.
✓ Coroutines & Flow Offloading: Tag ingestion runs on an isolated background IO dispatcher with smooth 60fps UI counters.
✓ Direct KeyCode 139 Handling: Clean event interception delivers seamless switching between 2D optical barcode and UHF RFID.
✓ Encrypted Local SQLite WAL: Buffers up to 250,000 tag scans offline and automatically resumes syncing upon network reconnect.

Interactive Developer Protocol Inspector

Real-Time ERP & Socket Payload Formats

Inspect the exact wire payloads emitted by our middleware when tags cross reader antenna fields.

Protocol: SAP S/4HANA & ECC 6.0 • IDoc MBGMCR03 (Goods Movement 101)

{
  "IDOC": {
    "EDI_DC40": {
      "IDOCTYP": "MBGMCR03",
      "MESTYP": "MBGMCR",
      "SNDPOR": "RFID_MIDDLEWARE_GATE04",
      "SNDPRT": "LS",
      "SNDPRN": "RFIDSOFT_EDGE_01",
      "RCVPRN": "SAP_S4H_PRD"
    },
    "E1MBGMCR": {
      "HEADER": {
        "PSTNG_DATE": "20260925",
        "DOC_DATE": "20260925",
        "PR_UNAME": "RFID_AUTO_GATE",
        "HEADER_TXT": "DOCK_GATE_04_INGEST"
      },
      "ITEMS": [
        {
          "MATERIAL": "MAT-POLY-88219",
          "PLANT": "1001",
          "STGE_LOC": "WH01",
          "MOVE_TYPE": "101",
          "ENTRY_QNT": "24.000",
          "ENTRY_UOM": "EA",
          "RFID_EPC_HEX": "E28011700000020B8A1A4F92",
          "ANTENNA_PORT": "2",
          "RSSI_DBM": "-42.5"
        }
      ]
    }
  }
}

Directly ingested via SAP .NET Connector 3.1 (NCo) or RFC Webhook without third-party middleware licenses.

Protocol: TallyPrime XML Server • Port 9000 Stock Journal Voucher

<ENVELOPE>
  <HEADER>
    <TALLYREQUEST>Import Data</TALLYREQUEST>
  </HEADER>
  <BODY>
    <IMPORTDATA>
      <REQUESTDESC>
        <REPORTNAME>Vouchers</REPORTNAME>
        <STATICVARIABLES>
          <SVCURRENTCOMPANY>Acme Manufacturing Ltd</SVCURRENTCOMPANY>
        </STATICVARIABLES>
      </REQUESTDESC>
      <REQUESTDATA>
        <TALLYMESSAGE xmlns:UDF="TallyUDF">
          <VOUCHER VCHTYPE="Stock Journal" ACTION="Create">
            <DATE>20260925</DATE>
            <VOUCHERNUMBER>RFID-SJ-2026-0925-001</VOUCHERNUMBER>
            <NARRATION>Automated RFID Dock Door 04 Read - 24 Units Transferred</NARRATION>
            <ALLINVENTORYENTRIES.LIST>
              <STOCKITEMNAME>Industrial ACP Sheet Grade-A</STOCKITEMNAME>
              <ISDEEMEDPOSITIVE>No</ISDEEMEDPOSITIVE>
              <RATE>1450.00</RATE>
              <AMOUNT>-34800.00</AMOUNT>
              <ACTUALQTY>-24.00 Nos</ACTUALQTY>
              <BILLEDQTY>-24.00 Nos</BILLEDQTY>
              <BATCHALLOCATIONS.LIST>
                <GODOWNNAME>Staging Bay 01</GODOWNNAME>
                <BATCHNAME>BATCH-2026-99A</BATCHNAME>
                <AMOUNT>-34800.00</AMOUNT>
                <ACTUALQTY>-24.00 Nos</ACTUALQTY>
              </BATCHALLOCATIONS.LIST>
            </ALLINVENTORYENTRIES.LIST>
          </VOUCHER>
        </TALLYMESSAGE>
      </REQUESTDATA>
    </IMPORTDATA>
  </BODY>
</ENVELOPE>

Dispatched via HTTP POST to http://localhost:9000/ with automatic retry buffer on connection loss.

Protocol: CloudEvents v1.0 • JSON Webhook Stream / MQTT Edge Broker

{
  "specversion": "1.0",
  "type": "com.rfidsoftwares.reader.llrp.ro_access_report",
  "source": "/readers/zebra-fx9600-dock04",
  "id": "evt-77b9-9182-41df",
  "time": "2026-09-25T14:38:12.104Z",
  "datacontenttype": "application/json",
  "data": {
    "readerModel": "Zebra FX9600 (8-Port)",
    "llrpProtocolVersion": "1.0.1",
    "tagReports": [
      {
        "epc": "E28011700000020B8A1A4F92",
        "tid": "E280110520006001004A760B",
        "antennaPort": 1,
        "peakRssi_dBm": -38.4,
        "phaseAngle_rad": 1.42,
        "frequency_kHz": 866300,
        "firstSeen": "2026-09-25T14:38:11.902Z",
        "lastSeen": "2026-09-25T14:38:12.084Z",
        "readCount": 14
      }
    ],
    "gpioState": {
      "pin1_photocell": "HIGH",
      "pin2_light_stack": "GREEN"
    }
  }
}

Compatible with Azure IoT Hub, AWS IoT Core, Kafka, RabbitMQ, and custom REST API endpoints.

Protocol: EPCglobal LLRP v1.0.1 • Raw TCP Socket Frame (Hex Interleaved)

// RO_ACCESS_REPORT Message Header (Type 61, Length: 58 bytes)
04 3D 00 00 00 3A 00 00 00 01
// TagReportData Parameter (Type 240)
00 F0 00 30
  // EPC-96 Parameter (Type 13)
  0D 00 0C E2 80 11 70 00 00 02 0B 8A 1A 4F 92
  // AntennaID Parameter (Type 1)
  00 80 01
  // PeakRSSI Parameter (Type 6, Value: -38 dBm)
  00 86 DA
  // FirstSeenTimestampUTC (Type 2)
  00 82 00 06 1A 84 92 11 02 A0

Parsed by our C# .NET 8 / C++20 reader daemon over TCP Port 5084 with zero heap allocation overhead.

Commercial Packages

Transparent Licensing & Deployment Tiers

Flexible deployment options scaled for pilot feasibility trials up to multi-site national operations.

01. Single Device Pilot

₹35,000 / one-time

Ideal for evaluating 1 handheld reader terminal in your live facility before fleet deployment.

✓ 1 Handheld Terminal License
✓ Full Android Inventory APK
✓ Geiger Proximity Locate Module
✓ CSV & REST API Export
✓ 30 Days Remote Engineering Support

Order Single Pilot

Certified Hardware Devices

Tested readers and terminals verified with this middleware

View All Hardware →

C72

Chainway C72 UHF Reader Hardware

Everything You Need to Know About Deployment

Detailed answers regarding system compatibility, protocol implementation, and post-go-live support.

How do I prevent 'Device Init Failed / UART Locked' errors on the Chainway C72?

Chainway handhelds communicate with the internal UHF module via serial UART (/dev/ttyMT2). If an Android app pauses, crashes, or reloads without explicitly freeing the native JNI driver, the port remains locked until a full reboot. Our middleware wraps RFIDWithUHFUART inside a persistent Android foreground service with safe lifecycle interception in onPause() and onDestroy(), ensuring clean port teardown and instant re-init.

How does the app capture the physical pistol trigger (KeyCode 139) without KeyboardEmulator conflicts?

Chainway's pre-installed KeyboardEmulator app intercepts hardware scan keys and injects raw text into focused fields, which corrupts JSON payloads and causes duplicate scans. Our middleware directly registers Android KeyCode 139 via onKeyDown()/onKeyUp() and instructs developers on setting KeyboardEmulator to Broadcast Receiver mode (action com.rscja.scanner.action.scanner) or disabling it completely.

How does the middleware process 750+ tags/sec without causing Android ANR crashes?

Default manufacturer sample code runs tag callbacks directly on the Android UI thread, causing Application Not Responding (ANR) dialogs during dense warehouse counts. Our middleware moves the native JNI C++ listener to a dedicated HandlerThread, queues incoming EPCs into an in-memory concurrent ring buffer, and throttles UI updates through Kotlin StateFlow at 60 fps.

How does offline mode function when workers lose Wi-Fi in deep warehouse aisles?

When Wi-Fi drops behind metallic storage racks, the middleware stores all scanned EPCs, timestamps, operator IDs, and bin locations in an on-device encrypted SQLite database. Once Wi-Fi or 4G connectivity is re-established, a resilient background WorkManager automatically batches and syncs the backlog to Tally Prime (XML HTTP on Port 9000) or SAP Business One with zero data loss.

How does Geiger-counter locate mode find missing inventory in warehouse racks?

Enter the target EPC or product SKU. The middleware switches the C72 into single-tag search mode, dynamically modulating RF output (5 dBm to 30 dBm). By analyzing real-time RSSI signal strength (-80 dBm to -30 dBm), it increases visual proximity meters and adjusts audio chirp frequency (200 Hz to 2,500 Hz), guiding the picker to misplaced items within ±10 cm.

Ready to Test This Middleware in Your Live Facility?

Don't spend 6 months building low-level Android JNI reader drivers from scratch. Test our pre-compiled APK on your hardware within 24 hours.

Request Test APK & Android SDK Docs → Speak to an RFID Solutions Architect

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Chainway C72 RFID Handheld Middleware: Android & Tally Sync

Continuous 750+ Tag/s Inventory Scanning Without Android Freezes

Direct KeyCode 139 Hardware Trigger

Offline SQLite WAL Cache & Auto-Sync

Geiger-Counter Proximity Locate Engine

ChainwayRfidForegroundService.kt Implementation Guide

Why Manufacturer Handheld Sample Apps Fail in Production

Real-Time ERP & Socket Payload Formats

Transparent Licensing & Deployment Tiers

Certified Hardware Devices

Related Solutions & Architecture Blueprints

Everything You Need to Know About Deployment

Ready to Test This Middleware in Your Live Facility?

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