Add heartbeat message

include/message.h

@@ -178,6 +178,17 @@ struct PACKED SetWheelSpeedResp
     struct Footer footer;
 };
 
+struct PACKED SdkHeartbeatReq {
+    struct Header header;
+    struct Footer footer;
+};
+
+struct PACKED SdkHeartbeatResp {
+    struct Header header;
+    uint8_t retcode;
+    struct Footer footer;
+};
+
 struct PACKED SetSdkModeReq {
     struct Header header;
     uint8_t enable;
@@ -213,6 +224,7 @@ union Request {
     struct Header header;
     struct SetSdkConnectionReq sdkconn;
     struct SetSdkModeReq sdkmode;
+    struct SdkHeartbeatReq heartbeat;
     struct SetSystemLedReq led;
     struct SetWheelSpeedReq wheel;
     struct SetChassisWheelSpeedReq chswheel;
@@ -225,6 +237,7 @@ union Response {
     struct Header header;
     struct SetSdkConnectionResp sdkconn;
     struct SetSdkModeResp sdkmode;
+    struct SdkHeartbeatResp heartbeat;
     struct SetSystemLedResp led;
     struct SetWheelSpeedResp wheel;
     struct SetChassisWheelSpeedResp chswheel;

include/sdk_connection.h

@@ -19,3 +19,9 @@ set_sdk_connection(
 		enum CONNECTION connection_type,
 		uint32_t ip_address,
 		uint16_t port );
+
+static const uint8_t SDK_HEARTBEAT_CMDID = 0xD5;
+
+void
+sdk_heartbeat(
+		Client session );