<bigger>Object Detector</bigger>

Used for... detecting objects... and also it gives you their inventories and properties :D

You can use it by just doing this:
<mono>
$C1 send_to(links.detector, { -- this just triggers the detector, you can do it with any message like "GET" or "POO", but with a table you may configure it
$C1     inventories = false, -- (default: true) if false, disables getting inventories and wielded items, may be useful to prevent a scenario where there is too much data.
$C1     props = false, -- (default: true) if false, disables getting the object properties.
$C1 })
</mono>

<big>The response:</big>
You can search <action name=link url=https://github.com/minetest/minetest/blob/5.9.0/doc/lua_api.md>lua_api.md</action> to figure out what the obj.something functions represent, or you can use dump(msg) to see at least what they behave like

The response is sent in a table, with these fields (depending on the object):
For both entities and players:
<mono>
is_player = obj:is_player()
nametag = obj:get_nametag_attributes()
pos = obj:get_pos(),
props = obj:get_properties()
hp = obj:get_hp()
armor_groups = obj:get_armor_groups()
velocity = obj:get_velocity()
</mono>

For entities only:
<mono>
acceleration = obj:get_acceleration(),
rotation = obj:get_rotation(),
yaw = obj:get_yaw(),
texture_mod = obj:get_texture_mod(),
name = obj:get_luaentity().name,
</mono>

For players only:
<mono>
name = v:get_player_name(),

camera = {
$C1    dir = v:get_look_dir(),
$C1    pitch = v:get_look_vertical(),
$C1    yaw = v:get_look_horizontal(),
$C1    fov = v:get_fov()
},
control = v:get_player_control(),
physics = v:get_physics_override(),
lighting = v:get_lighting(),

inv = settings.inventories v:get_inventory():get_lists(), -- but converts the ItemStacks into tables using <ItemStack>:to_table()
wield_index = v:get_wield_index(), -- can be used for fun stuff like controls in a game
wielded_item = settings.inventories and v:get_wielded_item(),
</mono>

(All of theese are in a table)

Good luck!