CC2564 maximum data length

Dan Wieland

We’re using the CC2564B part with SSO stack. I’ve got a question on maximizing data. How many bytes maximum can a Client send to a Server? What is the most efficient way to do this?

over 10 years ago

0 Sundeep Javvaji over 10 years ago

TI__Mastermind 32615 points

Hi,
what do you mean by maximizing data? are you referring to the MTU size?

0 Brent Huebert over 10 years ago in reply to Sundeep Javvaji

Expert 1140 points

Hi Sundeep,

Dan posted this question based on something I had asked him.

I've been asked what it will take to send a file (~30K) over BLE. (It doesn't seem like a great idea but I'm not a BLE expert.) In my company's project I'm sending and receiving basic data including a few character strings. However, I'm wondering how I might go about receiving a large file. What is the best way to do this?

Thanks,

Brent

0 Sundeep Javvaji over 10 years ago in reply to Brent Huebert

TI__Mastermind 32615 points

Hi,

For transferring big files it is always better to use BT. But I don't think there should be any problem in using BLE to do that (the through put will be less).
Mind that how many packets can be sent depend on size of the packet and connection interval, please see the Bluetooth Specification for more details.

0 Brent Huebert over 10 years ago in reply to Sundeep Javvaji

Expert 1140 points

Hi Sundeep,

Could you tell me the maximum packet size allowed?

Thank you,

Brent

0 Sundeep Javvaji over 10 years ago in reply to Brent Huebert

TI__Mastermind 32615 points

Hi,

The minimum value is 23 bytes as per the spec. please see file ATTTypes.h, ATT_PROTOCOL_MTU_MINIMUM_LE and ATT_PROTOCOL_MTU_MAXIMUM are defined.

0 Brent Huebert over 10 years ago in reply to Sundeep Javvaji

Expert 1140 points

Hi Sundeep,

Thank you for the reply. Just so I have this straight:

ATT_PROTOCOL_MTU_MAXIMUM is defined as 517. So if I had to send a 30 K file, it would take 64 write commands to transfer the entire file with the Blutopia stack functionality.

Does that sound right to you?

Thanks again for your attention to my question thread,

Brent

0 Sundeep Javvaji over 10 years ago in reply to Brent Huebert

TI__Mastermind 32615 points

Hi,

Mind that it also depends on the remote MTU.
Yes (if the remote MTU is greater than or equal to 517), please go through the Bluetooth specification for more clear understanding.

0 Brent Huebert over 10 years ago in reply to Sundeep Javvaji

Expert 1140 points

Thanks, Sundeep. That answers my question.
I can't find the "Verify Answer" button in this new forum layout.

0 Dan Wieland over 10 years ago in reply to Brent Huebert

TI__Intellectual 2625 points

Brent,
You have to be logged in to see the Verify Answer button.
Thanks,
Dan

0 Brent Huebert over 10 years ago in reply to Dan Wieland

Expert 1140 points

I have a couple other questions on the forums and I see that the "Verify Answer" does show up there. (I have to be logged in to post, don't I?) It's just not showing up in this one.

0 Brent Huebert over 10 years ago in reply to Brent Huebert

Expert 1140 points

Dan, perhaps beings you started this thread, you're the only one that can select "Verify Answer"? If so, please do so for Sundeep's last response.

0 Dan Wieland over 10 years ago in reply to Brent Huebert

TI__Intellectual 2625 points

Brent - I think you are right. I just moved it to Verified. Thanks for using the forums!

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CC2564 maximum data length