Use first bonded card10 in ConnectionService.

app/src/main/java/de/ccc/events/badge/card10/common/ConnectionException.kt

+/*
+ * Copyright by the original author or authors.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package de.ccc.events.badge.card10.common
+
+import android.content.res.Resources
+import de.ccc.events.badge.card10.R
+import java.lang.Exception
+
+class ConnectionException(message: String = Resources.getSystem().getString(R.string.connection_error_generic)) :
+    Exception(message)
\ No newline at end of file

app/src/main/java/de/ccc/events/badge/card10/common/ConnectionService.kt

@@ -22,12 +22,11 @@
 
 package de.ccc.events.badge.card10.common
 
-import android.bluetooth.BluetoothDevice
-import android.bluetooth.BluetoothGatt
-import android.bluetooth.BluetoothGattCallback
-import android.bluetooth.BluetoothGattCharacteristic
+import android.bluetooth.*
 import android.content.Context
 import android.util.Log
+import de.ccc.events.badge.card10.CARD10_BLUETOOTH_MAC_PREFIX
+import de.ccc.events.badge.card10.R
 import de.ccc.events.badge.card10.filetransfer.LowEffortService
 import java.lang.IllegalStateException
 import java.lang.NullPointerException
@@ -68,6 +67,20 @@ object ConnectionService {
             throw IllegalStateException()
         }
 
+        // Use first BLE devices that is bonded
+        val bondedDevices = BluetoothAdapter.getDefaultAdapter().bondedDevices.filter {
+            it.address.startsWith(
+                CARD10_BLUETOOTH_MAC_PREFIX,
+                true
+            )
+        }
+
+        if (bondedDevices.isEmpty()) {
+            throw ConnectionException(context.getString(R.string.connection_error_no_bonded_device))
+        }
+
+        device = bondedDevices[0]
+
         // 1. Connect
         // 2. Discover services
         // 3. Change MTU

app/src/main/java/de/ccc/events/badge/card10/filetransfer/FileTransferFragment.kt

@@ -34,6 +34,7 @@ import android.widget.ProgressBar
 import android.widget.TextView
 import androidx.annotation.UiThread
 import androidx.fragment.app.Fragment
+import de.ccc.events.badge.card10.CARD10_BLUETOOTH_MAC_PREFIX
 import de.ccc.events.badge.card10.R
 import de.ccc.events.badge.card10.common.ConnectionService
 import de.ccc.events.badge.card10.common.GattListener
@@ -72,15 +73,11 @@ class FileTransferFragment : Fragment(), GattListener, FileTransferListener{
 
         buttonStartStop = view.findViewById(R.id.button_start_stop_transfer)
 
-        connect()
+        initConnection()
         toggleControls()
     }
 
-    private fun connect() {
-        // Test function that connects to specific card10
-        val remoteDevice = BluetoothAdapter.getDefaultAdapter().getRemoteDevice("00:05:8B:44:42:42")
-        ConnectionService.device = remoteDevice
-
+    private fun initConnection() {
         val ctx = context ?: throw IllegalStateException()
         ConnectionService.connect(ctx)
     }

app/src/main/res/values/strings.xml

@@ -24,4 +24,7 @@
     <string name="app_detail_downloads">Downloads: %1$d</string>
     <string name="app_detail_content_size">Size: %1$d</string>
     <string name="app_detail_button_download">Download</string>
+
+    <string name="connection_error_generic">Connection error</string>
+    <string name="connection_error_no_bonded_device">No bonded card10s available</string>
 </resources>