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DJ2LS / FreeDATA

A free, open-source, multi-platform application for sending files and messages, using the codec2 HF modems
https://wiki.freedata.app/
GNU General Public License v3.0
143 stars 18 forks source link

Messaging Improvement #711

Closed jpronans closed 3 weeks ago

jpronans commented 5 months ago

Is your feature request related to a problem? Please describe. Long term testing has shown that its possible for me to receive a beacon from someone else, but they can't hear me due to local their noise level.

At present, the only way to ascertain if they can possibly receive a message is to first ping them, if the ping is successful, then there is a possibility that the message may go through. Not always.

Describe the solution you'd like I can quickly think of two possibly ways to deal with it 1) Before a message attempt is made, a ping gets sent to the other station, if the received SNR from the remote is enough to sustain a message session then the session should proceed to be established

2) If I receive the remote station at -4 (for example) and I make a message attempt. Apply a penalty (1db for example). The second, message attempt will not start until the received SNR is up to -3.. the third at -2, the 4th at -1 etc etc.. If a SNR is received higher than or equal this 'threshold' then an automatic message send can take place.

DJ2LS commented 5 months ago

I made some first adjustments regarding to this:

I reduced the connection attempts to 5, and we are only resending the message, if we have a minimum SNR of -2dB.

DJ2LS commented 2 months ago

I also added a slot based busy detection, sure, might need some fine tuning, but this might improve this topic as well. After some testing, I think we can close this one, as we have SNR based check and QRM based checks