YamaCorpDisplayController

-- YamaCorpDisplayController, 2022, Yamazouki
REDNET_SIDE =
TIMEOUT_DELAY = 30

rednet.open(REDNET_SIDE)

function generateErrorMessage (str)
    return {"Error :", 0xFF0000, str, 0xFF0000}
end

ids = {}
msg = {}

while true do
    rnID, rnMsg, rnProto = rednet.receive("YamaCorp", TIMEOUT_DELAY)

    msg = {}
    msg.protocol = "display"
    msg.body = {}

    if rnID == nil then
        print("No signals since " .. TIMEOUT_DELAY .. "s")
        table.insert(msg.body, generateErrorMessage("no signal from main controller"))
    else
        if (rnProto == "YamaCorp") then
            rnMsg =  textutils.unserializeJSON(rnMsg)

            if (rnMsg == nil) then
                print("error serializing JSON")
                table.insert(msg.body, generateErrorMessage("JSON error"))
            else
                proto = rnMsg.protocol
                body = rnMsg.body

                if (proto == 'global') then
                    if (body == 'restart') then
                        os.reboot()
                    end
                elseif (proto == 'connect') then
                    table.insert(ids, rnID)
                elseif (proto == 'display') then
                    msg.body = body
                end
            end
        end

    end

    for i, id in ipairs(ids) do
        rednet.send(id, textutils.serializeJSON(msg), YamaCorp)
    end
end