Changing Writable_ndef_message example to send custom messages from TWI

[jake11212]

    Hello,

I'm working on a program that receives the temperature over TWI, saves the temperature in a string to flash memory, then adds this string to an NDEF message to be advertised.  So far I'm able to get the temperature string and I've modified the ndef_file_load() function to correctly find and open this temperature string, which I've verified.  However, when I try to read the NDEF message using an NFC tools app nothing appears.  

I read the custom messages NFC page (http://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.1.0/nrf/include/nfc/ndef/nfc_ndef.html) and it seems that the nfc_ndef_msg_encode() function needs to be used, then that encoded message needs to be added a buffer to be sent over NFC.  Is this correct?

Where does the ndef_file_load() function encode the message?  From what I can see the function just opens and reads the file from flash memory then closes the file.  Also how do I add an encoded file to the buffer to be sent over NFC?

Thanks!

[Øyvind]

Hello, 

Can you please provide more information on what board and SDK version you are you using? I see you have referred to an older version of NCS (v1.1.0). Please note that latest version is on v1.6.1.

Kind regards,
Øyvind

[jake11212]

Ah that may be an issue, I'm using SDK 17.0.2 not NCS so the documentation I was looking at was incorrect.  The board I'm using is the nRF52DK.  

I'm using the nfc_writable_ndef_msg example within the 17.0.2 SDK.

[Øyvind]

Ah, yes, that would explain it. Have a look at the nRF5 SDK v17.0.2 documentation here.

NFC examples are described here.

Kind regards,
Øyvind

[Øyvind]

Please note that the nRF Connect SDK also has support for nRF52 devices, and includes several NFC samples found here