Check return value of udp_send and forward it WiFiUdp::endPacket

[everslick]

I see high packet loss when sending rapid UDP packets without yield() or delay(). A yield() after each packet does only help slightly, but delay(1) after each Udp.write() works around that bug.

Problem description:

The MAC layer seems to drop packets if the send queue is full, but this condition is not reported back to the application (endPacket() should return 0 in this case).

[igrr]

I have addressed this in commit aa67d1c, however it appears that udp_sendto doesn't actually return errors when underlying packet buffer is full.

[everslick]

so i guess it's up to espressif to fix this then. :-/ no idea where to
report this though.

On Wed, Mar 2, 2016 at 6:00 PM, Ivan Grokhotkov [email protected]
wrote:

I have addressed this in commit aa67d1c
aa67d1c,
however it appears that udp_sendto doesn't actually return errors when
underlying packet buffer is full.

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#1696 (comment).

[electron1979]

May be related to my problem. Issue #2340