  In recent years, the Internet of Things (IoT) has drawn convincing research
ground as a new research topic in a wide variety of academic and industrial
disciplines, especially in healthcare. The IoT revolution is reshaping modern
healthcare systems by incorporating technological, economic, and social
prospects. It is evolving healthcare systems from conventional to more
personalized healthcare systems through which patients can be diagnosed,
treated, and monitored more easily. The current global challenge of the
pandemic caused by the novel severe contagious respiratory syndrome coronavirus
2 presents the greatest global public health crisis since the pandemic
influenza outbreak of 1918. At the time this paper was written, the number of
diagnosed COVID-19 cases around the world had reached more than 31 million.
Since the pandemic started, there has been a rapid effort in different research
communities to exploit a wide variety of technologies to combat this worldwide
threat, and IoT technology is one of the pioneers in this area. In the context
of COVID-19, IoT enabled /linked devices/applications are utilized to lower the
possible spread of COVID-19 to others by early diagnosis, monitoring patients,
and practicing defined protocols after patient recovery. This paper surveys the
role of IoT-based technologies in COVID-19 and reviews the state-of-the-art
architectures, platforms, applications, and industrial IoT-based solutions
combating COVID-19 in three main phases, including early diagnosis, quarantine
time, and after recovery.
