unknown p_type + extern C

gateway_protocol/gateway_protocol.c

-#include <gateway_protocol.h>
+#include <gateway_protocol/gateway_protocol.h>
 
 
 void gateway_protocol_packet_encode (

gateway_protocol/gateway_protocol.h

@@ -6,13 +6,18 @@
 
 #define GATEWAY_PROTOCOL_PACKET_SIZE_MAX    128
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef enum {
     GATEWAY_PROTOCOL_PACKET_TYPE_DATA_SEND = 0x00,
     GATEWAY_PROTOCOL_PACKET_TYPE_PEND_REQ = 0x04,
     GATEWAY_PROTOCOL_PACKET_TYPE_PEND_SEND = 0x05,
     GATEWAY_PROTOCOL_PACKET_TYPE_STAT = 0x10,
     GATEWAY_PROTOCOL_PACKET_TYPE_TIME_REQ = 0x20,
-    GATEWAY_PROTOCOL_PACKET_TYPE_TIME_SEND = 0x21
+    GATEWAY_PROTOCOL_PACKET_TYPE_TIME_SEND = 0x21,
+    GATEWAY_PROTOCOL_PACKET_TYPE_UNKNOWN = 0xFF
 } gateway_protocol_packet_type_t;
 
 typedef enum {
@@ -37,4 +42,8 @@ uint8_t gateway_protocol_packet_decode (
     const uint8_t packet_length,
     const uint8_t *packet);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // __GATEWAY_PROTOCOL_H__
\ No newline at end of file