-- RedNet Sniffer
_RNSV = 4.2 -- RedNet Sniffer Version

function DEC_HEX(IN)
    local B,K,OUT,I,D=16,"0123456789ABCDEF","",0
    while IN > 0 do
        I = I + 1
        IN,D = math.floor(IN/B), (IN%B)+1
        OUT = string.sub(K,D,D)..OUT
    end
    if OUT == "" then OUT = "0" end
    return OUT
end

-- Initialize Rednet on the modem side
local modem = peripheral.wrap("back") -- Adjust as necessary
modem.open(65533)

print("Sniffer Running v" .. _RNSV)

while true do
    -- Broadcast a request to all devices
    modem.broadcast("Who's there?")

    -- Wait for responses indefinitely
    while true do
        local senderId, replyChannel, response, senderDistance = os.pullEvent("modem_message")

        -- Clear the terminal
        term.clear()
        term.setCursorPos(1, 1)

        -- Display received message
        print("\n--- New Message Detected ---")
        print("Sender ID: " .. DEC_HEX(senderId))
        print("Reply Channel: " .. replyChannel)
        print("Message: " .. textutils.serialize(response))

        -- Display distance with color coding
        local color
        if senderDistance < 10 then
            color = colors.red
        elseif senderDistance < 20 then
            color = colors.orange
        elseif senderDistance < 30 then
            color = colors.yellow
        else
            color = colors.white
        end

        term.setTextColor(color)
        print("Sender Distance: " .. senderDistance)
        term.setTextColor(colors.white) -- Reset color
        print("------------------------------")

        -- Pause for a moment before listening again
        sleep(2) -- Adjust delay for readability
    end
end