Nice thing. I like in the description how you use NFC just for association. But when will you add eink and other hardware options?

I use mostly similar hardware made in China. The real added value is eink, so the label is also readable by humans (text) and existing machines (QR). When you have eink prototypes, I may have clients for you.

Also, do you plan to have temperature sensors? It is an easy addition, and opens a large new market.

Another good thing to have can be 433/868/915 Mhz - some companies like to leverage their existing radio, but the protocols can be a pain to deal with.