From: Xie He > Sent: 05 November 2020 07:35 > > This driver transports LAPB (X.25 link layer) frames over TTY links.
I don't remember any requests to run LAPB over anything other than synchronous links when I was writing LAPB implementation(s) back in the mid 1980's. If you need to run 'comms over async uart links' there are better options. I wonder what the actual use case was? David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)