If you want to maintain real-time performance, the RF part of the module must be turned on, waiting for data processing at any time. For example, the TYZS3 module has a power of 8mA in receiving mode, if it is always at 8mA consumption, it is fatal to battery-powered places. Therefore, keep the low power can only make the module enter deep sleep (below 10uA) and so turn off the radio.