cc_relay

-- Simple relay

local server_channel = 23
local client_channel = 43


local controller_modem_side = "back"
local remote_modem_side = "top"


local controller_modem = peripheral.wrap(controller_modem_side)
local remote_modem = peripheral.wrap(remote_modem_side)

controller_modem.open(client_channel)
remote_modem.open(server_channel)
controller_modem.open(server_channel)
remote_modem.open(client_channel)


local server_step = 0


while true do
    local event, side, channel, reply, message, distance = os.pullEvent("modem_message")
    if event == "modem_message" then
        -- Relay
        if side == controller_modem_side then
            print("Relaying to remote")
            remote_modem.transmit(channel, server_channel, message)
        elseif side == remote_modem_side then
            print("Relaying to controller")
            -- We encode a step because OC receives duplicates
            controller_modem.transmit(channel, server_step, message)
            server_step = server_step + 1
            if server_step == 256 then
                server_step = 0
            end
        end
    end
end