NDEF URL gets mangled for some tags

[Hoggy78]

Hello

I have the code:

    #read the tag ID
    tag = nfc.tag.activate(clf, target)
    tag_id = str(tag).split('ID=')[1]

    if last_tag != tag_id:

        #write the URL
        time.sleep(0.2)
        url_address= 'https://app.xxxxxxxxxxxxxx.com/index.php?uid='+tag_id
        print (url_address)
        uri, title = url_address, "My Title"
        time.sleep(0.1)
        tag.ndef.records = [ndef.SmartposterRecord(uri, title)]
        time.sleep(0.1)

This pretty much works 50/50, some tags it writes well, others the URI is mangled for example:

https://app.xxxxxxxxxxxxxx.com0448551a2e1291448551a2e1291/

where the UUID of the tag is 0448551A2E1291

I put some sleeps in in case it wasn't completing the write before my loops but that made no difference, i also printed the URL to screen to make sure that is being formulated correctly and it is so it is the write part that is inconsistent.

With some tags it works perfectly, but others do not, they are all Ntag213, the same spec tags

I also tried erasing the tags

Ideally, I would like to just do this by enabling mirroring on the NTag 21x protocol if that is a cleaner method, but I can't find documentation for that on nfcpy