add heartbeat, not tested yet.

lichao

2021-04-09 4e5cb7960ce4e7e66d5190be67426aeca8b55c3d

 src/proto.h

@@ -19,6 +19,7 @@
#define PROTO_UA9UWKL1

#include "bhome_msg.pb.h"
#include "bhome_msg_api.pb.h"

using namespace bhome::msg;