Keep-alive for wireless network

摘要: A transmitting device transmits data to one or more receiving devices. At least of the devices a keep-alive device. The is transmitted at reduced rate relative transmission rate. In some implementations multiple may transmit keep-alives. these cases, each its keep-alives according schedule prevent reduce likelihood overlapping be selected Here, if stops another Through use above techniques, need not keep track which are listening transmission. Rather, simply stop in event that it no longer receives