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the enddevice joins the network of the router

hi everyone !

Today,I find out when the enddevice joins the network of router,after about 1 hour ,the current consumption of  enddevice is about 30 MA,but by sniffer tools I can't capture any RF data which is transmitted by the enddevice;however it is very

regular about  1 hour and the 30 MA lasts forever untill the enddevice restarts ,and then every is normally!