Revert "Remove self-message kind"

This reverts commit 2a7da92.

Author: n-jay

src/inet/routing/leach/Leach.cc

@@ -59,6 +59,7 @@ void Leach::start() {
     configureInterfaces();
 
     // schedules a random periodic event
+    event->setKind(SELF);
     scheduleAt(simTime() + uniform(0.0, par("startupDelay").doubleValue()),
             event);
 }
@@ -106,6 +107,7 @@ void Leach::handleMessageWhenUp(cMessage *msg) {
         }
 
         // schedule another self message every time new one is received by node
+        event->setKind(SELF);
         scheduleAt(simTime() + roundDuration, event);
         // if node is receiving message
     } else if (check_and_cast<Packet*>(msg)->getTag<PacketProtocolTag>()->getProtocol()
@@ -123,6 +125,7 @@ void Leach::handleMessageWhenDown(cMessage *msg) {
 
 void Leach::handleSelfMessage(cMessage *msg) {
     if (msg == event) {
+        if (event->getKind() == SELF) {
             auto ctrlPkt = makeShared<LeachControlPkt>();
 
             // Filling the LeachControlPkt fields
@@ -146,6 +149,7 @@ void Leach::handleSelfMessage(cMessage *msg) {
             send(packet, "ipOut");
             packet = nullptr;
             ctrlPkt = nullptr;
+        }
     } else {
         delete msg;
     }