Does it have the same 10kb limit as Pusher does?

Yes it does!

Lines 79 to 87 in d0d68bc

    
           test "valid_entity_length with data key bigger than 10KB" do 
        
             data = File.read! "test/more_than_10KB.data" 
        
             event = %PusherEvent{data: data} 
        
             expect(:cowboy_req, :set_resp_body, 2, :req2) 
        
             assert valid_entity_length(:req, %{event: event}) == {false, :req2, %{event: event}} 
        
             assert validate :cowboy_req 
        
           end

As far as I understand Pusher has it to limit client's ability to send unlimited data, but if it's self hosted, does it really make sense to have this limit? Make it optional at least?
@edgurgel

Yes, It is there to protect servers so that they don't get overloaded. I would accept a PR to make it configurable through Application env (config.exs). Then users could simple say: my limit is 1 GB, etc

	test "valid_entity_length with data key bigger than 10KB" do
	data = File.read! "test/more_than_10KB.data"
	event = %PusherEvent{data: data}
	expect(:cowboy_req, :set_resp_body, 2, :req2)

	assert valid_entity_length(:req, %{event: event}) == {false, :req2, %{event: event}}

	assert validate :cowboy_req
	end