I want to simulate the collision avoidance between different objects that use (IoT based) centralized, decentralized, or distributed wireless sensor network. What are free software available to achieve my goal? I would like to know which one is easiest to learn. I tried cupcarbon but couldn't find tutorials of my interest. Thanks.

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    Hi maxpayne, what exactly do you want to simulate? Which OSI-layer are you talking about. Collisions on signal, package or application level? – Helmar Aug 5 '18 at 8:39
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    @Helmar Collision avoidance system is the main goal through knowing position of sensors in the field or through rssi. But i am currently interesting in simulating the various nodes in different areas. Communication of nodes to each other, sending receiving singnals, setup sink, router, server, etc in the system. – maxpayne Aug 5 '18 at 8:48
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    Still, collision avoidance on which layer are you interested in? RSSI screams level 1, collision avoidance is usually done level 2 upwards. – Helmar Aug 5 '18 at 8:54
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    Yes, right. RSSI at level 1 and collision at level 2. – maxpayne Aug 5 '18 at 9:10

Have a look at the emane project (usually paired with the core project).

This project lets you build emulations of the raw radio layer and then add the higher level network layers on top.

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