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As far as I can recall MESH also isn't time exact (just like TCP and UDP aren't), since it's also just a protocol to communicate with peers.
In the end you will need some sort of sync-method.

FranckM wrote:I succeeded by using UDP, but the lag is considerable and my stations end up de-synced by half a second of what the AP is showing.

I'm surprised by that. UDP should be quick. I wonder if it is an implementation issue rather than UDP.

rudy wrote:

FranckM wrote:I succeeded by using UDP, but the lag is considerable and my stations end up de-synced by half a second of what the AP is showing.

I'm surprised by that. UDP should be quick. I wonder if it is an implementation issue rather than UDP.

To be honest so am I. If I want fast (but not guaranteed) comms between UNIX boxes I use UDP.

but if you send the byte sequentially over crowded WiFi to several receivers you can get serious delay between the first and last station; people tend to forget that WiFi is a shared unidirectional medium (unlike ethernet)