Features

Added support for Template Tags
Send hardware and software information (hardware model, operating system, soc) during registration and boot (too keep it up to date)
Added post-reload-hook and post-registration-hook
Added management_interface config option, which allows sending the IP of the management interface to OpenWISP, a pre-requisite for enabling features of OpenWISP as push updates, firmware upgrades and fping health checks
Added support for hardware ID / serial number
Added random bootup delay
Added default_hostname config option
Improved automatic recovery of previous backups when configuration updates fail
Added post_reload_delay and test_retries config options

Changes

Backward incompatible change: list options are now overwritten to prevent duplication
Improved log message in case of registration failure
Allow $MAC_ADDRESS to be bridge
Removed polarssl
Check sanity of downloaded UCI files before applying them
Give up with registration only when 403 is returned by the server
Show entire registration error message in logs
Updated examples and precompiled packages to use OpenWRT 19.07
Made check of OpenWISP Controller header case insensitve

Ensured order of UCI sections is preserved during config write
operations, handle special section types
Ensure anonymous UCI config sections are handled well
Ensure removal of files only includes items which are not in the new downloaded configuration
Fixed duplication of list options
Fixed a bug that caused /etc/config/openwisp to be overwritten