TLS handshake error/unknown certificate

[digisus]

I am close to getting it running with a RM1 on Debian trixie, but not yet...

1. The browser, pointing to http://192.168.1.156:2001/, says

Client sent an HTTP request to an HTTPS server.

2. bash:

root@reMarkable:~# ./goMarkableStream
Local IP address: 10.11.99.1
Local IP address: 192.168.1.156
2024/12/09 12:47:46 listening on [::]:2001
2024/12/09 12:48:00 http: TLS handshake error from 192.168.1.54:54244: remote error: tls: unknown certificate
2024/12/09 12:48:16 http: TLS handshake error from 192.168.1.54:38092: remote error: tls: unknown certificate

The "listening" line looks strange? "[::]"

3. I try enforcing https:// and get window in the browser asking to login. I tried root/pw of Remarkable, but got an "Unable to connect" in the browser.

What else can I try? Thanks for any hint!