gitmodu / lola Goto Github PK

View Code? Open in Web Editor NEW

5.0 5.0 1.0 3.92 MB

Low Latency Radio System

License: MIT License

C++ 75.33% C 21.30% Assembly 3.37%

arduino-library cryptography delta-updates half-duplex low-latency packet radio-drivers totp

lola's People

Contributors

Stargazers

Watchers

Forkers

shozuke

lola's Issues

SyncSurface partial resync algorithm is getting stuck.

If some of the blocks were missed during sending, the writer will just keep sending the last block on the surface. This must be improved, to either force a full resync or send the missing blocks map (it's just 1 byte).

Services still responding to packets when no link is active.

Also, I think the Acks are also being auto-replied.

Collision avoidance solutions

Current solution: Avoid sending anything while we keep getting packets. This allows for a user service to saturate the link and eventually lose the link, because no Ack can come back.

GPS TimeSync: sync the time to the GPS PPS. Is extremely accurate, but may need up to 12 minutes of Satellite line-of-sight before start.

Fallback solution: Implement the PTPSync service, which should be able to sync the radio Millis() source to the ~1ms. Requires a lot of flash and RAM but works in any case.

These can get us a synced time source for millis.

Once we have that, we can schedule the windows for sending, maybe around 5:5 ms for each.
Also, with a known time source, we can finally implement some basic crypto.

Recommend Projects