Proxy host

local client

local sides = {"top", "bottom", "left", "right", "front", "back"}

local function ports()
    for i,v in pairs(sides) do
        rednet.open(v)
    end
end

ports()

while true do
    local id, msg = rednet.receive()
    sleep(0)
    local isP = false
    if id == client then
        isP = true
    end
    if isP == false and string.sub(msg, 1, 6) == "PROXY:" then
        isP = true
        client = id
        print("New client")
    end
    if isP == true and string.sub(msg, 1, 6) == "PROXY:" then
        local tbl = textutils.unserialize(string.sub(msg, 7))
        if not tbl then tbl = {} end
        if tbl.send and type(tbl.send) == "number" and tbl.send > -1 then
            pcall(function()
                rednet.send(tbl.send, tbl.message)
                print("Sent new message to "..tbl.send)
            end)
        elseif tbl.send and tbl.send == "broadcast" then
            pcall(function()
                rednet.broadcast(tbl.message)
                print("Broadcasted message")
            end)
        end
    elseif client ~= nil then
        pcall(function()
            rednet.send(client, textutils.serialize({rep=id, message=msg}))
            print("Sent message to client")
        end)
    else
        print("Message was not valid isP was "..tostring(isP))
    end
end