So, to summarize what we found out during the discussion in the above comments: It seems that you cannot use an IntentService to handle access to an NFC tag (through a received NFC discovery intent) in a separate thread. In that case the tag technology object's connect() method will fail.. This does not mean that you cannot handle access to a tag in a separate (worker) thread.
However, a few companies produce kits to add NFC support to specific smartphones, such as the iPhone and Android. One such company is DeviceFidelity. It produced a microSD card and app that you can use to add NFC support to Symbian, Windows mobile 6.x, Blackberry, iPhone, or certain Androidmodels. How to Make NFC Coasters That Connect Houseguests to Your Mar 17, 2018 List of NFC-enabled mobile devices - Wikipedia
Secure NFC | Android Open Source Project
Dec 12, 2016 · SEE ALSO: How to Totally Automate Android Using Tasker Check if Your Android Phone Has NFC Capabilities. NFC is a technology that can be put to use in a myriad of ways, automating tasks from basic things like triggering an SMS, to opening a web URL, placing a call, or doing basically anything that you can program onto an NFC tag. It seems that you cannot use an IntentService to handle access to an NFC tag (through a received NFC discovery intent) in a separate thread. In that case the tag technology object's connect() method will fail. This does not mean that you cannot handle access to a tag in a separate (worker) thread. NFC stands for Near Field Communication, it is a short-range wireless technology that enables the communication between devices over a distance of less than 10 cm. The NFC standard is defined in ISO/IEC 18092.
Turn NFC on your Samsung Galaxy S8 Android 7.0 on or off
May 31, 2017 What is NFC and why should I use it? | AndroidPIT Sep 25, 2018 Help Guide | Connecting with an NFC-compatible device by