Could someone please help me out with this? I'm confused and don't know exactly what it is I'm doing. The errors and warnings are confusing.

So I'm pretty new to this distributed systems stuff and was wondering if anyone could possibly help me out. I came across a very old link mentioning an assignment about a 'HELLO Protocol' and in the assignment it's mentioning sending and receiving HELLO, HELLO_Ack to several nodes. Now I'm not using this REAL simulator the guy mentions to use. I'm practicing using LINUX Terminal. I actaully have a server I can access in which I've already ran some example codes on.

So for the CSIM part. I've read the Getting Started: CSIM Simulation Engine (C Version). Now I've read to where it explains Mailboxes in CSIM and this is where it actually confuses me. Keep in mind I'm testing myself so I have little knowledge on this stuff. Using CSIM's guide how would I go about structuring this 'HELLO Protocol'? Am I going to have A client call and a server call in the program? From what I'm understanding is that I would be writing a program that would that would generate a local server for the nodes to communicate back and fourth in.

Here is my Stack Overflow link I've created including my source code and the errors I'm getting
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