wes3 commented on issue #477: npl/riot: reduce default MSYS_1_BLOCK_SIZE to minimum URL: https://github.com/apache/mynewt-nimble/pull/477#issuecomment-507816029 @haukepetersen I can understand why you might want to try to come up with an absolute minimum number of buffers used by nimble but I think it might end up being a bit tricky. Unfortunately I do not know the host well enough to comment on what you have mentioned above so others would have to chime in. Regarding the controller: the controller does not require a mbuf to send an empty pdu; there is an empty pdu structure it uses for this. Of course, the controller needs a mbuf to receive something from the peer controller so if there are none available no data will flow in that direction. Note that the connection will still continue in this case; the controller simply does not ack the transmission and the transmission should keep being repeated by the peer controller until a mbuf is available for reception. I will see if I can dig up how the 292 was calculated.
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