remove --prefer-ipv6 flag

openwisp-config/files/sbin/openwisp-get-address.lua

@@ -1,33 +1,17 @@
 #!/usr/bin/env lua
 
 -- gets the first useful address of the specified interface
--- fistly tries to get an IPv4 address, if not found, tries to get an IPv6 address
--- with the --prefer-ipv6 option, it will try to get an IPv6 address first
 -- usage:
---   * openwisp-get-address <ifname> [--prefer-ipv6]
---   * openwisp-get-address <network-name> [--prefer-ipv6]
+--   * openwisp-get-address <ifname>
+--   * openwisp-get-address <network-name>
 local os = require('os')
 local net = require('openwisp.net')
 local name = arg[1]
-local prefer_ipv6 = arg[2] == "--prefer-ipv6"
-
-local ip_version1, ip_version2
-
-if prefer_ipv6 then
-  ip_version1 = 'inet6'
-  ip_version2 = 'inet'
-else
-  ip_version1 = 'inet'
-  ip_version2 = 'inet6'
-end
-
-
-local interface = net.get_interface(name, ip_version1)
+local interface = net.get_interface(name, 'inet')
 if not interface then
-  interface = net.get_interface(name, ip_version2)
+  interface = net.get_interface(name, 'inet6')
 end
 
-
 if interface then
   print(interface.addr)
 else