minetest.register_on_joinplayer(function(player)
      minetest.register_globalstep(function(dtime)
            local prev_item = player:get_wielded_item()
            minetest.after(0.2, function()
                if prev_item ~= player:get_wielded_item() then
                   minetest.chat_send_all(player:get_wielded_item():get_name())
                end
            end)
      end)
end)