How is data sent


#1

Folks,

Curious, what determines when the data is sent from the R-Pi to FlightAware?

Is it a timed upload or is it quantity of data? If for some reason the sending of data fails due to network, is it resent later or is that data lost?

Geffers


#2

ADSB messages are sent in TCP packets. Either the packet fills up and then is sent right away OR the time limit is reach and the packet is sent with whatever it has.

There are some rules about how or if the data will be used. In most cases if it doesn’t reach the FA server within a time limit it is thrown away.

Data can be lost but in most cases a nearby site would have sent the same or similar data.


#3

TCP is sent again if it fails (part of the protocol) but if the network is down then the connection can’t be established and the data is not sent.