* Add ser2net mDNS USB serial discovery
* Add support for using multiple UsbSerialDiscovery services
* Add Ser2NetUsbSerialDiscovery that can use mDNS to discover ser2net RFC2217 serial ports
* Use discovered USB ports in SerialConfigOptionProvider
mDNS discovery is supported in ser2net 4.3.0 and newer.
E.g. you can install a ser2net version that provides this using APT in Ubuntu 21.04 and Debian 11.
Example ser2net YAML configuration that allows a serial port to be discovered using mDNS discovery:
%YAML 1.1
---
connection: &con01
accepter: telnet(rfc2217),tcp,2222
connector: serialdev,/dev/ttyUSB0
options:
mdns: true
mdns-sysattrs: true
mdns-name: devicename
Closes#1511
Signed-off-by: Wouter Born <github@maindrain.net>
