Use pipes to store pubsub messages

include/pubsub.h

@@ -17,27 +17,18 @@
 
 #define MAX_STR_SIZE 1024
 
-struct strNode {
-  char *str;
-  struct strNode *next;
-};
-typedef struct {
-  struct strNode *head;
-  struct strNode *tail;
-} StrQueue;
-
 typedef struct {
     UA_UInt16 id;
     UA_Double latitude;
     UA_Double longitude;
     UA_Double altitudeAbs;
     UA_Double altitudeRel;
-    UA_Int64 timestamp;
+    UA_Int64  timestamp;
     UA_Float  yaw;
     UA_Float  speed;
     UA_Float  climbRate;
-    StrQueue receiveMessageQueue;
-    StrQueue receiveLogQueue;
+    int receiveMessagePipefds[2];
+    int receiveLogPipefds[2];
 } JSDroneData;
 
 typedef struct {