Merge pull request #1160 from google/embedded

Merge embedded branch

Author: jgsobczak

embedded/Makefile

@@ -7,6 +7,8 @@
 
 GTEST_DIR   = ../third_party/gtest/googletest/
 GMOCK_DIR   = ../third_party/gtest/googlemock/
+MBEDTLS_DIR = ../third_party/mbedtls/
+
 
 ARCH        ?= host
 OUT_DIR_NAME ?= $(ARCH)
@@ -84,12 +86,42 @@ ifeq ($(wildcard common/target/$(ARCH_COMMON_NAME)),)
 $(error need to create directory common/target/$(ARCH_COMMON_NAME) )
 endif
 
+ifdef NEARBY_FP_ENABLE_BATTERY_NOTIFICATION
+CFLAGS += -DNEARBY_FP_ENABLE_BATTERY_NOTIFICATION=$(NEARBY_FP_ENABLE_BATTERY_NOTIFICATION)
+endif
+
+ifdef NEARBY_FP_ENABLE_ADDITIONAL_DATA
+CFLAGS += -DNEARBY_FP_ENABLE_ADDITIONAL_DATA=$(NEARBY_FP_ENABLE_ADDITIONAL_DATA)
+endif
+
+ifdef NEARBY_FP_MESSAGE_STREAM
+CFLAGS += -DNEARBY_FP_MESSAGE_STREAM=$(NEARBY_FP_MESSAGE_STREAM)
+endif
+
+ifdef NEARBY_FP_RETROACTIVE_PAIRING
+CFLAGS += -DNEARBY_FP_RETROACTIVE_PAIRING=$(NEARBY_FP_RETROACTIVE_PAIRING)
+endif
+
+ifdef NEARBY_FP_BLE_ONLY
+CFLAGS += -DNEARBY_FP_BLE_ONLY=$(NEARBY_FP_BLE_ONLY)
+endif
+
+ifdef NEARBY_FP_PREFER_BLE_BONDING
+CFLAGS += -DNEARBY_FP_PREFER_BLE_BONDING=$(NEARBY_FP_PREFER_BLE_BONDING)
+endif
+
+ifdef NEARBY_FP_PREFER_LE_TRANSPORT
+CFLAGS += -DNEARBY_FP_PREFER_LE_TRANSPORT=$(NEARBY_FP_PREFER_LE_TRANSPORT)
+endif
 COMMON_INCLUDE_DIRS += \
     -I. \
     -I$(ARCH_COMMON_DIR) \
     -Icommon/target \
     -Icommon/target/$(ARCH_COMMON_NAME) \
     -I$(COMMON_DIR)
+ifeq ($(NEARBY_PLATFORM_USE_MBEDTLS),1)
+COMMON_INCLUDE_DIRS += -I$(MBEDTLS_DIR)/include
+endif
 
 CLIENT_INCLUDES += \
     -I$(CLIENT_DIR) \

embedded/README.md

@@ -28,4 +28,16 @@ Nearby SDK assumes a single-threading model. All calls to the SDK must be on the
     nearby_fp_client_Init(NULL);
     nearby_fp_client_SetAdvertisement(NEARBY_FP_ADVERTISEMENT_DISCOVERABLE);
     ```
-1. Use [Fast Pair Validator](https://play.google.com/store/apps/details?id=com.google.location.nearby.apps.fastpair.validator) to verify that your device is behaving correctly.
+1. Use [Fast Pair Validator](https://play.google.com/store/apps/details?id=com.google.location.nearby.apps.fastpair.validator) to verify that your device is behaving correctly.
+
+## Optional modules
+The optional modules provide partial implementation of HAL interfaces using common libraries, mbedtls in particular.
+
+1. *mbedtls* located in `common/source/mbedtls/mbedtls.c` implements `nearby_platform_Sha256Start()`, `nearby_platform_Sha256Update()`, `nearby_platform_Sha256Finish()`, `nearby_platform_Aes128Encrypt()`, `nearby_platform_Aes128Decrypt()`.
+
+Nearby SDK can be configured to use the MBEDTLS package, commonly available on ARM
+implementations, with the config.mk flag `NEARBY_PLATFORM_USE_MBEDTLS`.
+
+2. *gen_secret* located in `common/source/mbedtls/gen_secret.c` implements `nearby_platform_GenSec256r1Secret()`.
+
+*gen_secret* generates a shared secret based on a given private key on platforms that don't support hardware SE. *gen_secret* module is enabled `NEARBY_PLATFORM_USE_MBEDTLS` is set and `NEARBY_PLATFORM_HAS_SE` is *not* set. When `NEARBY_PLATFORM_HAS_SE` is set, the platform needs to provide their own `nearby_platform_GenSec256r1Secret()` routine.