BP6 + SIM/IC card adapter: reading a SIM over HDUART — ATR captures fine, but the card issues a T=0 repeat/NAK on every byte I transmit. Is a full APDU session over HDUART bridge supported?

General
6

@jalruiz - Do you have the self-contained repro script, which should “just work” correctly on the BP5, and will fail as indicated on the BP6?

I’m new to this adapter, and having trouble getting any response from the card.

Sequence I’m trying, based on the docs:

m hduart -b 9600 -d 8 -p even -s 2 -l listen
W 3.3
P
G 1 # 3.5712mhz 50%
[
a 2; @ 2

No response yet from a BP5 with firmware from commit d821f1344fa561a015362b5499ef9606cc16df69 (May 27, 2026) … not even the 0xFF you see.

Maybe I’ve configured something wrongly?