The TNEP tag sample demonstrates how to use the TNEP for tag device library to exchange data using NFC’s TNEP Protocol on an NFC Tag device.


The sample supports the following development kits:

Hardware platforms


Board name

Build target

nRF5340 DK



nrf5340dk_nrf5340_cpuapp_ns nrf5340dk_nrf5340_cpuapp

nRF52 DK




nRF52840 DK





The sample uses the Type 4 Tag as the tag transport layer. It creates the initial NDEF message that contains the Services Parameter records and the NDEF records.

If the NFC polling device does not support the TNEP library, it can interact with the NDEF records. If the poller supports the TNEP library, it can select the TNEP Service and exchange data with it.

Every TNEP Tag service has a callback structure that provides information to the application about Service State changes. The sample has two TNEP services defined, each of them containing the NDEF text records.

User interface

LED 1:

Lit when the TNEP Tag is initialized.

LED 3:

Lit when the TNEP service one is selected.

LED 4:

Lit when the TNEP service two is selected.

Button 1:

Press to provide the application data when the application service two is selected.

Building and running

This sample can be found under samples/nfc/tnep_tag in the nRF Connect SDK folder structure.

See Building and programming an application for information about how to build and program the application and Testing and debugging an application for general information about testing and debugging in the nRF Connect SDK.


After programming the sample to your development kit, you can test it with an NFC-A polling device that supports NFC’s Tag NDEF Exchange Protocol. Complete the following steps:

  1. Connect to the kit with a terminal emulator (for example, PuTTY). See How to connect with PuTTY for the required settings.

  2. Reset the development kit.

  3. Touch the NFC antenna with the NFC polling device.

  4. Observe the output in the terminal.

  5. If the NFC polling device selects the service two, you have 27 seconds to press Button 1 to provide application data. If you do not do this, the NFC polling device deselects the service.


This sample uses the following nRF Connect SDK libraries:

In addition, it uses the following Zephyr libraries:

  • include/sys/until.h