ping_listener

STD_MODEM_SIDE = "left"
PING_PONG_CHAN = 5

function receivePing (message, dist)
    print("Received msg: " ..(message or "nil message").. "\n")
    print("Sender is " ..(tostring(dist) or "an unknown number of").. "blocks away.\n")
end

local modem = peripheral.wrap(STD_MODEM_SIDE)
modem.open(PING_PONG_CHAN)
print("Listening on channel: "  ..tostring(PING_PONG_CHAN).. "\n")
local event, side, senderChan, replyChan, message, dist = os.pullEvent("modem_message")


receivePing(message, dist)