Background Process for ios and android

Background services is not working in iOS after 30 seconds. When using workmanager plugin for background fetch, dnssd_clientstub write_all(10) DEFUNCT
2019-12-17 16:20:58.230944+0530 Runner[1972:771820] dnssd_clientstub deliver_request ERROR: write_all(10, 68 bytes) failed
2019-12-17 16:20:58.230987+0530 Runner[1972:771820] dnssd_clientstub write_all(10) DEFUNCT issue occurred while uploading images on server in iOS after 30 seconds.