OTcl and C++ linkages in NS2
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This document discusses OTCL/C++ linkages and provides an example of creating a simple agent class in C++ and exposing it to OTCL. It shows the C++ code for the TSPAgent class with public, private and protected variables and functions. It then shows how to define a TclClass for TSPAgent and register it. The example demonstrates how to instantiate a TSPAgent object from OTCL and call its member functions. The document also briefly describes two case studies on multimedia over UDP and provides information on where to modify different aspects of the NS-2 network simulator code.
![Simple Agent
int TSPAgent::command(int argc, const char*const*
argv) {
if(argc == 2) {
if(strcmp(argv[1], "call-tsp-priv-func") == 0) {
TSPPrivFunc();
return(TCL_OK);
}
}
return(Agent::command(argc, argv));
}](https://image.slidesharecdn.com/session4-otclclinkages-171209043926/85/OTcl-and-C-linkages-in-NS2-7-320.jpg)
![Creation of a Simple Agent
#name it as .tcl file
# Create TSPAgent
set myagent [new Agent/TSPAgentOtcl]
# Set configurable parameters of TSPAgent
$myagent set tsp_var1_otcl 2
$myagent set tsp_var2_otcl 3.14
# Give a command to TSPAgent
$myagent call-tsp-priv-fun](https://image.slidesharecdn.com/session4-otclclinkages-171209043926/85/OTcl-and-C-linkages-in-NS2-9-320.jpg)
OTcl and C++ linkages in NS2
- 10. Case study – 2 – Multimedia over udp • to build a multimedia application that runs over a UDP connection, • five rate media scaling • by changing encoding and transmission policy pairs associated with scale parameter values.
- 11. Case study – 2 – Multimedia over udp • Based on 5 rate – 0 0.3mb – 1 0.6mb – 2 0.9mb – 3 1.2mb – 4 1.5mb – Packetsize 1000 – Random false
- 13. Where to modify • ~ns-2.34 is the folder where all the cc modules are located Topic Where to modify Routing Protocol (AODV, DSDV, DSR) ~ns-2.34/aodv/aodv.cc, aodv_rtable.cc, etc Mobile Node (Energy, Propagation, Antenna) ~ns-2.34/mobile/*.cc and *.h TCP (Vegas, Reno, New Reno, etc) ~ns-2.34/tcp/ *.cc New packet, agent to be added ~ns-2.34/common/packet.h, agent.h Wireless Physical layer or MAC Layer modification ~ns-2.34/mac/*.cc
- 14. Where to modify Topic Where to modify MPLS ~ns-2.34/mpls Adding a new Queue ~ns-2.34/queue/*.cc and *.h Adding a new application ~ns-2.34/apps/app.h Sensors ~ns-2.34/sensor-net (still to be developed) Examples (more than 100) ~ns-2.34/tcl/ex/ What not lot more in NS2