[nrfconnect] Defined default MRP retry intervals for the platform

The nrfconnect platform requires some custom MRP retry intervals
that are proven by tests to work for Wi-Fi and Thread.

Added defining MRP retry values to the nrfconnect platform code.

examples/lighting-app/nrfconnect/main/include/CHIPProjectConfig.h

@@ -30,8 +30,3 @@
 // Use a default pairing code if one hasn't been provisioned in flash.
 #define CHIP_DEVICE_CONFIG_USE_TEST_SETUP_PIN_CODE 20202021
 #define CHIP_DEVICE_CONFIG_USE_TEST_SETUP_DISCRIMINATOR 0xF00
-
-//  Switching from Thread child to router may cause a few second packet stall.
-//  Until this is improved in OpenThread we need to increase the retransmission
-//  interval to survive the stall.
-#define CHIP_CONFIG_MRP_LOCAL_ACTIVE_RETRY_INTERVAL (1000_ms32)

src/platform/nrfconnect/CHIPPlatformConfig.h

@@ -95,3 +95,20 @@
 #define CHIP_CONFIG_LOG_MODULE_Support_PROGRESS 0
 #define CHIP_CONFIG_LOG_MODULE_DeviceLayer_DETAIL 0
 #endif
+
+// Set MRP retry intervals for Thread and Wi-Fi to test-proven values.
+#ifndef CHIP_CONFIG_MRP_LOCAL_ACTIVE_RETRY_INTERVAL
+#if CHIP_ENABLE_OPENTHREAD
+#define CHIP_CONFIG_MRP_LOCAL_ACTIVE_RETRY_INTERVAL (800_ms32)
+#else
+#define CHIP_CONFIG_MRP_LOCAL_ACTIVE_RETRY_INTERVAL (500_ms32)
+#endif
+#endif // CHIP_CONFIG_MRP_LOCAL_ACTIVE_RETRY_INTERVAL
+
+#ifndef CHIP_CONFIG_MRP_LOCAL_IDLE_RETRY_INTERVAL
+#if CHIP_ENABLE_OPENTHREAD
+#define CHIP_CONFIG_MRP_LOCAL_IDLE_RETRY_INTERVAL (800_ms32)
+#else
+#define CHIP_CONFIG_MRP_LOCAL_IDLE_RETRY_INTERVAL (500_ms32)
+#endif
+#endif // CHIP_CONFIG_MRP_LOCAL_IDLE_RETRY_INTERVAL