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I need to implement timer in Omnet++. Scenario : There are 2 nodes(Say A and B). Node A sends a msg to node B. Then a timer need to be started. If it doesnot receive any msg from node B within a specific period, the connection should end.

Guru karthik
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    I wonder how beneficial the C++ tag is to this question. It attracts a lot of extra eyes to the question, but relatively few will be able to help you because they aren't familiar, or familiar enough, with omnet. – user4581301 Feb 17 '22 at 00:12

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In OMNeT++ timer is a message that is scheduled to trigger in the future in that module using scheduleAt(). That message is called "selfmessage" and it is used to implement "timer". When the selfmessage occurs, handleMessage() is called - just like for any other message.
In short: to implement selfmessage one should:

  1. Declare and then create an instance of cMessage.
  2. Schedule that message using:

scheduleAt(simTime() + somePeriod, someMessage)
where simTime() returns current simulation time.

  1. In handleMessage() recognize that selfmessage, for example using isSelfMessage(), and call desired code.

Moreover, take a look at TicToc examples: TicToc doumentation - 3.6 Modeling processing delay

Jerzy D.
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