Use two buffers instead of one buffer in split mode #18
Conversation
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Do you have any comments on this PR? |
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I've just looked at it (and tested it) and it seems like a reasonable addition. However I'm currently having memory constraints in Arduino's main application of this library (that is the Arduino IoT Cloud firmware) so I'd rather hold off merging this in for now. |
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If you have memory constraints, I could tune the PR to update the default values of |
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Good morning @ffontaine 👋 This sounds like an acceptable compromise, can you please update this PR accordingly? |
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Sure, however I'm not a user of the Arduino IoT Cloud firmware so what default values will please you? 4k for each buffer? 8k for input and 4k for output or even 8k for each buffer (even if this one seems a bit oversized) |
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So. I've investigated the current situation and found the following results. This is how the buffer is structured currently:
If your PR can preserve this structure then that would be great. |
Use two dedicated buffers for input and output instead of split mode.
Indeed some MQTT server (especially with TLS) needs a full 8k buffer as
they send their Certificate. On the other hand, on output, a smaller
buffer is needed.
Clients will be able to finely tune those values by defining
BEAR_SSL_CLIENT_{I,O}BUF_SIZE before including ArduinoBearSSL.h, the
default default values have been chosen to keep current behavior as
requested during review.
Signed-off-by: Fabrice Fontaine <[email protected]>
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OK done |
Use two dedicated buffers for input and output instead of split mode,
indeed some MQTT server (especially with TLS) needs a full 8k buffer as
they send their Certificate Chain. On the other hand, on output, a 1k
buffer seems to be enough
Signed-off-by: Fabrice Fontaine [email protected]