Efficient way of using characteristics

RE: Efficient way of using characteristics

junsoo337 — Fri, 08 Jul 2016 01:23:14 GMT

dear Hung, i would like to ask you for more detail technical information about "a lot of overhead" and "by grouping the 2 characteristics you can send more data"

2-characteristic than 1-characteristic have a overhead more? isn't it? why the group can send more data when 1 packet?

thank you

RE: Efficient way of using characteristics

Andreas — Tue, 22 Mar 2016 16:20:04 GMT

Thank you very much.

RE: Efficient way of using characteristics

Hung Bui — Tue, 22 Mar 2016 15:59:15 GMT

Yes, it will save you some little space for the RAM of the Attribute table. But not the RAM used for number of connection as when configuring the softdevice (the RAM area for application)

RE: Efficient way of using characteristics

Andreas — Tue, 22 Mar 2016 15:21:54 GMT

Hello Hung, thanks for your reply. That was also my feeling. Thanks for your confirmation. Does this change the RAM/Stack usage of the softdevice?

RE: Efficient way of using characteristics

Hung Bui — Tue, 22 Mar 2016 15:11:08 GMT

Hi,

It's better to group the 2 characteristic into one, you will save a lot of overhead. Also there is another limitation on the number of packet per connection interval. Some central only allow 1 packet per connection interval, by grouping the 2 characteristics you can send more data. The maximum payload size of a packet is 20 bytes.