Darwin BLE: fix GetMTU() so it returns the actual MTU size instead of…

… zero (#10017)
project-chip · Oct 6, 2021 · 1013336 · 1013336
1 parent e691520
commit 1013336
Showing 1 changed file with 10 additions and 1 deletion.
diff --git a/src/platform/Darwin/BlePlatformDelegateImpl.mm b/src/platform/Darwin/BlePlatformDelegateImpl.mm
@@ -114,7 +114,16 @@
             return true;
         }
 
-        uint16_t BlePlatformDelegateImpl::GetMTU(BLE_CONNECTION_OBJECT connObj) const { return 0; }
+        uint16_t BlePlatformDelegateImpl::GetMTU(BLE_CONNECTION_OBJECT connObj) const
+        {
+            CBPeripheral * peripheral = (__bridge CBPeripheral *) connObj;
+
+            // The negotiated mtu length is a property of the peripheral.
+            uint16_t mtuLength = [[peripheral valueForKey:@"mtuLength"] unsignedShortValue];
+            ChipLogProgress(Ble, "ATT MTU = %u", mtuLength);
+
+            return mtuLength;
+        }
 
         bool BlePlatformDelegateImpl::SendIndication(
             BLE_CONNECTION_OBJECT connObj, const ChipBleUUID * svcId, const ChipBleUUID * charId, PacketBufferHandle pBuf)