Fix issue with CBS

contrib/tsn/model/cbs.cc

@@ -64,9 +64,6 @@ Cbs::IsReadyToTransmit()
 {
   NS_LOG_FUNCTION(this);
   if(m_credit>=0){
-    if (m_state==WAITING){
-      UpdateCredit(false);
-    }
     return true;
   }
   else{
@@ -75,6 +72,26 @@ Cbs::IsReadyToTransmit()
   }
 }
 
+void
+Cbs::Update()
+{
+  NS_LOG_FUNCTION(this);
+  if (m_state != TRANSMITTING)
+  {
+    if (m_queue->IsEmpty())
+    {
+      m_state = IDLE;
+    }
+    else
+    {
+      m_state = WAITING;
+    }
+  }
+  UpdateCredit(false);
+}
+
+
+
 void
 Cbs::UpdateCredit(bool trigger_cb)
 {
@@ -82,8 +99,6 @@ Cbs::UpdateCredit(bool trigger_cb)
   NS_ASSERT_MSG(m_idleSlope < m_maxIdleSlope, "Trying to use an idleSlope higher than " << m_maxIdleSlope << ".");
 
   Time sinceLastCreditUpdate = Simulator::Now() - m_lastUpdateCreditTime;
-  NS_LOG_INFO(sinceLastCreditUpdate);
-  NS_LOG_INFO("State = " << m_state);
   if(m_transmissionGateIsOpen){
     if(m_state == WAITING)
     {