ubus = require 'ubus'

local conn = ubus.connect()
if not conn then
    error('Failed to connect to ubusd')
end

local interface = 'ttk'
local status = conn:call('network.interface.' .. interface, 'status', { })
if status.up then
    -- argh, there is no RAII...
    conn:close()
    return
end

local logStatus = conn:call('log', 'write', { event = interface .. ' is down. Trying to restart...' })

-- this from official wiki. Maybe it is outdated
-- status = conn:call('network.interface.' .. interface, 'up', { })
-- found in /sbin/ifup script
status = conn:call('network.interface', 'up', { interface = '' .. interface })
-- print(tostring(status))
-- logStatus = conn:call('log', 'write', { event = 'interface.up = ' .. status })

conn:close()