Re: [mqtt-comment] Why Maximum Packet Size = 2,684,354,565?

[Roger Light <roger@atchoo.org>]

Hi Tatsuzo,

It's down to the way the "remaining length" value is constructed. It
is 4 bytes with the most significant bit of each byte being a
continuation bit. This gives us 7 bits of integer data per "byte", so
a 28 bit integer in total. 2^28 = 268435456.

Cheers,

Roger


On 14 August 2017 at 13:16, Tatsuzo Osawa <tatsuzo.osawa@gmail.com> wrote:
> Hi there,
>
> Could you show the reason of magic number "2,684,354,565" of Maximum
> Packet Size ?
>
> Regards,
> Tatsuzo Osawa
>
> --
> This publicly archived list offers a means to provide input to the
> OASIS Message Queuing Telemetry Transport (MQTT) TC.
>
> In order to verify user consent to the Feedback License terms and
> to minimize spam in the list archive, subscription is required
> before posting.
>
> Subscribe: mqtt-comment-subscribe@lists.oasis-open.org
> Unsubscribe: mqtt-comment-unsubscribe@lists.oasis-open.org
> List help: mqtt-comment-help@lists.oasis-open.org
> List archive: http://lists.oasis-open.org/archives/mqtt-comment/
> Feedback License: http://www.oasis-open.org/who/ipr/feedback_license.pdf
> List Guidelines: http://www.oasis-open.org/maillists/guidelines.php
> Committee: http://www.oasis-open.org/committees/mqtt
> Join OASIS: http://www.oasis-open.org/join/
>