AUTHOR=Imran Muhammad Ali , Zoha Ahmed , Zhang Lei , Abbasi Qammer H. TITLE=Grand Challenges in IoT and Sensor Networks JOURNAL=Frontiers in Communications and Networks VOLUME=1 YEAR=2020 URL=https://www.frontiersin.org/journals/communications-and-networks/articles/10.3389/frcmn.2020.619452 DOI=10.3389/frcmn.2020.619452 ISSN=2673-530X