Android cannot recognize emulated card, while iPhone can

[hhhtylerw]

Running the emulate_tag_ndef example, as is, I am able to emulate an nfc card with a single URL record. Using NFC Tools, I am able to both read and write the emulated card using my iPhone XR, however, I am unable to do the same with my Pixel 8.

What could be causing this?

For further context, my Pixel is capable of reading and writing cards (this is a physical card I wrote to previously):

This is what my iPhone reads off of the emulated card:

Perhaps the problem could have something to do with the lack of any standard "Technology" or other field in the emulated card? I'm just grasping at straws here. I have very little NFC knowledge, so it's possible I'm just emulating the wrong type of card entirely.

My setup:
PN532 over HSU

[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
lib_deps = 
    https://github.com/Seeed-Studio/PN532.git
build_flags =
    -DNFC_INTERFACE_HSU

[r8u]

Same issue here.

[ackPeng]

@hhhtylerw Hi, my phone is Redmi K70 Pro, it is an Android system, I used a tool that seems to be able to read its information,What NFC tool are you using?

[ackPeng]

In addition, when I used it, the data reception was occasionally incomplete. After that, I put the card on the phone again and it was able to recognize all the data. Could it be caused by poor contact?

[hhhtylerw]

@ackPeng This is the NFC app I am using. I believe it is the most popular one in the US.

Normally, when you hold a phone near an NFC tag with an NDEF URL message, the phone will pop up with a link that you can click without the use of any scanner app. I can not get that to work on Android either. It is definitely not a contact issue.

I notice that your Tag Type is ISO 14443-4 while mine is ISO 7816. I really am not sure why that is. Are we using the same model? This is mine:

[ackPeng]

@hhhtylerw Yes, when I put the NFC tag close to my phone without opening the app, a link will appear; I also downloaded your app and found that it can still read the card information. Maybe it’s because we use different chips? The picture shows the hardware I used and the results on the phone:

[hhhtylerw]

@ackPeng wow that is very interesting. Thank you for taking the time to test that out for me. I think I will have to buy that same PN532 model that you have and see if that fixes my problem. Perhaps it is also the model of my phone, my OS, or maybe that I am using an ESP32.
I will write back, eventually. 🫡

[ackPeng]

@hhhtylerw okk,Welcome to your further feedback. This issue will close. If you have further questions, you can open a new one.