From 747f3083ab9e464d4a685b9267f562efd59073de Mon Sep 17 00:00:00 2001
From: Martijn van Welie <martijn.van.welie@philips.com>
Date: Fri, 8 May 2020 17:29:19 +0200
Subject: [PATCH] Adding new functionality to issue PIN codes for peripherals
 with a fixed PIN code

---
 .../java/com/welie/blessed/BluetoothCentral.java    | 13 +++++++++++++
 .../java/com/welie/blessed/BluetoothPeripheral.java | 12 +++++++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/blessed/src/main/java/com/welie/blessed/BluetoothCentral.java b/blessed/src/main/java/com/welie/blessed/BluetoothCentral.java
index e8c12de..8c68894 100644
--- a/blessed/src/main/java/com/welie/blessed/BluetoothCentral.java
+++ b/blessed/src/main/java/com/welie/blessed/BluetoothCentral.java
@@ -118,6 +118,7 @@ public class BluetoothCentral {
     private final Map<String, Integer> connectionRetries = new ConcurrentHashMap<>();
     private boolean expectingBluetoothOffDisconnects = false;
     private Runnable disconnectRunnable;
+    private Map<String, String> pinCodes = new ConcurrentHashMap<>();
 
     //region Callbacks
 
@@ -289,6 +290,11 @@ public void run() {
                 }
             });
         }
+
+        @Override
+        public String getPincode(BluetoothPeripheral device) {
+            return pinCodes.get(device.getAddress());
+        }
     };
 
     //endregion
@@ -902,6 +908,13 @@ private void cancelAutoConnectTimer() {
         }
     }
 
+    /**
+     * Add a fixed PIN code for a peripheral
+     */
+    public void addPinForPeripheral(String peripheralAddress, String pin) {
+        pinCodes.put(peripheralAddress, pin);
+    }
+
     /**
      * Remove bond for a peripheral.
      *
diff --git a/blessed/src/main/java/com/welie/blessed/BluetoothPeripheral.java b/blessed/src/main/java/com/welie/blessed/BluetoothPeripheral.java
index 160b925..4c828cb 100644
--- a/blessed/src/main/java/com/welie/blessed/BluetoothPeripheral.java
+++ b/blessed/src/main/java/com/welie/blessed/BluetoothPeripheral.java
@@ -717,8 +717,16 @@ public void onReceive(final Context context, final Intent intent) {
                 return;
 
             // String values are used as the constants are not available for Android 4.3.
-            final int variant = intent.getIntExtra("android.bluetooth.device.extra.PAIRING_VARIANT"/*BluetoothDevice.EXTRA_PAIRING_VARIANT*/, 0);
+            final int variant = intent.getIntExtra("android.bluetooth.device.extra.PAIRING_VARIANT", 0);
             Timber.d("pairing request received " + ", pairing variant: " + pairingVariantToString(variant) + " (" + variant + ")");
+
+            if (variant == PAIRING_VARIANT_PIN) {
+                String pin = listener.getPincode(BluetoothPeripheral.this);
+                if (pin != null) {
+                    Timber.d("Setting PIN code for this peripheral using '%s'", pin);
+                    device.setPin(pin.getBytes());
+                }
+            }
         }
     };
 
@@ -1742,6 +1750,8 @@ interface InternalCallback {
          */
         void disconnected(BluetoothPeripheral device, final int status);
 
+        String getPincode(BluetoothPeripheral device);
+
     }
 
     /////////////////