fix: stop low-level card scan & deactivate RF on stop detection

Author: jeanpierrefortune

CHANGELOG.md

@@ -5,6 +5,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- Card scanning process. Now, the low-level card scanning is properly stopped and the RF field is 
+  deactivated when the card detection is stopped, resulting in improved battery life for the 
+  terminal. 
 
 ## [2.1.1] - 2023-01-10
 ### Added

bluebird-plugin/src/main/kotlin/org/calypsonet/keyple/plugin/bluebird/BluebirdContactlessReaderAdapter.kt

@@ -294,7 +294,11 @@ internal class BluebirdContactlessReaderAdapter(activity: Activity) :
     try {
       nfcBroadcastReceiver.listener = listener
       nfcReader.cardTypeForScan = pollingProtocols
-      var status = nfcReader.startScan()
+      var status = nfcReader.BBextNfcCarrierOn()
+      if (status != ExtNfcReader.ResultCode.SUCCESS) {
+        Timber.e("Error while setting the RF field on")
+      }
+      status = nfcReader.startScan()
       // If the reader is already started -> stop it then re-start it
       if (status == ExtNfcReader.ResultCode.ERROR_ALREADY_ON_SCANNING) {
         status = nfcReader.stopScan()
@@ -342,6 +346,14 @@ internal class BluebirdContactlessReaderAdapter(activity: Activity) :
    */
   override fun onStopDetection() {
     Timber.d("Stop card scan")
+    var status = nfcReader.stopScan()
+    if (status != ExtNfcReader.ResultCode.SUCCESS) {
+      Timber.e("Error while stopping the scan")
+    }
+    status = nfcReader.BBextNfcCarrierOff()
+    if (status != ExtNfcReader.ResultCode.SUCCESS) {
+      Timber.e("Error while setting the RF field off")
+    }
     nfcBroadcastReceiver.unregister()
   }
 

gradle.properties

@@ -1,7 +1,7 @@
 group = org.calypsonet.keyple
 title = Keyple Plugin CNA Bluebird Specific NFC Java Lib
 description = Keyple add-on to manage Bluebird Specific NFC readers
-version = 2.1.1
+version = 2.1.2
 archivesBaseName = keyple-plugin-cna-bluebird-specific-nfc-java-lib
 
 javaSourceLevel = 1.6