function wrap(side)
	if peripheral.getType(side) == "sensor" then
		return peripheral.wrap(side)
	else
		return nil, "not a sensor"
	end
end

function call(side, ...)
	if peripheral.getType(side) == "sensor" then
		return peripheral.call(side, ...)
	else
		return nil, "not a sensor"
	end
end