function ping()
    rednet.broadcast("Nano_Mining_Ping")
end

function isFull()
    local c=0
    for i=4,16 do
        if turtle.getItemCount(i)==0 then
            c=c+1
        end
    end
    if c<2 then
        return true
    else
        return false
    end
end

function refuel()
  for i=1,16 do
        turtle.select(i)
        turtle.refuel(64)
    end

end

function dump()
    turtle.select(1)
    turtle.turnRight()
    turtle.turnRight()
    turtle.place()
    for i=4,16 do
        turtle.select(i)
        turtle.drop()
    end
    turtle.dig()
    turtle.turnLeft()
    turtle.turnLeft()
end

function empty()
    if isFull() then dump() end
end

function dig()
    repeat turtle.dig() empty() ping() until not turtle.detect()
end

function digUp()
    repeat turtle.digUp() empty() ping() until not turtle.detectUp()
end

function digDown()
    repeat turtle.digDown() empty() ping() until not turtle.detectDown()
end

function forward()
    repeat
    while turtle.getFuelLevel() == 0 do
        print("waiting for fuel...")
        refuel()
    end
    until turtle.forward()
    ping()
end

function up()
    repeat until turtle.up()
end

function down()
    repeat until turtle.down()
end

rednet.open("right")
while true do
    local a,b,c=rednet.receive()
    print(a,b,c)
    if a==69 or a==36 then
        if b == "left" then turtle.turnLeft() end
        if b == "right" then turtle.turnRight() end
        if b == "forward" then forward() end
        if b == "back" then turtle.back() end
        if b == "up" then up() end
        if b == "down" then down() end
        if b == "dig" then dig() end
        if b == "digUp" then digUp() end
        if b == "digDown" then digDown() end
    print(b)
    end
end