nfc-tools
ACS ACR122U is End of Life
FULL DISCLOSURE: I am the CEO of GoToTags, an NFC software and hardware company and have a financial interest here. That being said I feel this content is of value to this community; if the maintainers disagree please delete and accept my apologies.
The ACR122U (desktop) and ACR122T (thumb) are End of Life and is not being made by ACS anymore; this change happened as of 10/14/2020 but has taken time to sell out. The vast majority of the ACR122U product you see for sale on Amazon, eBay, .... are clones and not made by ACS; take that for what you want. This is one of the many reasons that ACS made this decision. ACS will tell you to use the ACR1252U, but as Im sure this project is aware that uses a different NXP controller (PN512) and not the PN532 which is in the ACR122U. The ACR122U supports direct transmit which allows you to access the NFC controller and subsequently the NFC chip directly. The ACR1252U has a different operating model but does support PCSC 2 which also allows you to directly access the NFC controller, but in a much different way that the ACR122U's direct transmit.
The good news here is that there is a replacement for the ACR122U by a different company; it is the CIR215A. It also has the PN532 NFC controller. In our testing it is 95% compatible with the ACR122U, with the small differences being improvements in my opinion. There would likely be a bit of work for this project to support it, but not much. I bring this up as GoToTags does not yet stock this product because there is no demand because its a new and unknown product. However if enough people in this project are interested in this product we will stock it for resale. If you are interested or have any questions, please email us at help at gototags.com.
ACS EoL
CIR215A
This was really helpful, i ordered the one on Amazon as you described above and it's been a nightmare to use. It doesn't seem to be compatible with DNA424's either. Thanks for the heads up!
