Where the sent message is stored in "nfc writable ndef msg" example?

[BelvitaSoft]

Hi guys,

to process the NFC data sent from a smartphone to NRF, I use the "nfc writable ndef msg example".  However, the issue is that I cannot find a variable where the sent data is stored. It is necessary to find this buffer to realize new steps in a program code. 

Can you point me the location where a received text is kept?

Best regards for the whole Nordic association,
Greeting from Columbia! 
B.S. 

[Heidi]

Hi! The 'm_ndef_msg_buf' buffer stores the current NDEF message.

Best regards,

Heidi

[BelvitaSoft]

Hi Heidi, thank you for your response! 

I considered that there the data is stored, but when I want to print it I receive 536873068 value. Moreover, a value 536873068 does not change even I send a completely different message.

Do you know how can I obtain the string that I sent from a mobile app? 

 

Best Regards,
B.S. 

[Heidi]

Hi! Could you copy and paste in a comment how you print the data from the buffer.

Use "Insert" and "Insert code" and choose the language for easy readability.

Thanks!

[BelvitaSoft]

Hello!

In the function "scheduler_ndef_file_update" in the main I use - NRF_LOG_INFO("my buf %u, my size %u", m_ndef_msg_buf, m_ndef_msg_len + NLEN_FIELD_SIZE);

And I got: "my buf 536873068, my size 14". When I tried to print char as %c then I got random character.

The result that I am looking for is the string, which I sent from the mobile app. Any suggestion?

Best regards,
B.S. 

[Heidi]

Hi!

To print the contents of the buffer you will need something like this:

 

for (int i = 0; i < NDEF_FILE_SIZE; i++)
{
	NRF_LOG_INFO("%c", m_ndef_msg_buf(i));
}		

How arrays work in C, an array name always point to the memory address of the starting element of the array, 536873068, which is why it stays constant regardless of contents.

Best regards,

Heidi

[BelvitaSoft]

Hi, it works! Just for the next Nordic generations - the brackets have to be squared ;) 

Thanks and all the best!
B.S.