WiFi Mesh MESH_NODES swithcing to closer Parents if low RSSI

[MichaelS]

I am using ESP IDF ver 5.5.0 and WiFi Mesh network.
My network is self forming with some node having a weak RSSI to their parent, and I want to lower this.
IDF API provides 2 function for controlling thresholds but little by way of description on how to use them.
I used

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esp_mesh_get_rssi_threshold(&threshold)

to read the default RSSI thresholds and received the following thresholds:
threshold.high = -78;
threshold.medium = -82;
threshold.low = -85;
So I lowered them using

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esp_mesh_set_rssi_threshold(&threshold)

to:
threshold.high = -70;
threshold.medium = -75;
threshold.low = -80;

And similarly I used

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esp_mesh_get_switch_parent_paras(&params)

to read the default params and got:
params.duration_ms = 60000; // Parent weak RSSI monitor duration, if the RSSI continues to be weak during this duration_ms, device will search for a new parent
params.cnx_rssi = -120; // RSSI threshold for keeping a good connection with parent.
params.select_rssi = -78; // RSSI threshold for parent selection. It should be a value greater than switch_rssi
params.switch_rssi = -78; // Disassociate with current parent and switch to a new parent when the RSSI is greater than this set threshold
params.backoff_rssi = -78; // RSSI threshold for connecting to the root
So I lowered them using

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esp_mesh_set_switch_parent_paras(&params)

to:
params.duration_ms = 60000; // Parent weak RSSI monitor duration, if the RSSI continues to be weak during this duration_ms, device will search for a new parent
params.cnx_rssi = -80; // RSSI threshold for keeping a good connection with parent.
params.select_rssi = -70; // RSSI threshold for parent selection. It should be a value greater than switch_rssi
params.switch_rssi = -70; // Disassociate with current parent and switch to a new parent when the RSSI is greater than this set threshold
params.backoff_rssi = -68; // RSSI threshold for connecting to the root

But some of my MESH_NODEs are still holding parent connections at -89dBm and are not switching to closer parent nodes.

The documents say thing like "select_rssi is the RSSI threshold for parent selection. It should be a value greater than switch_rssi", but the default parameter I read they are the same threshold.
I would like them to switch to closer parents if the RSSI is worse than -70dBm.
I cant understand from the description the difference between params.cnx_rssi, params.select_rssi and params.switch_rssi and I don't know how to set them to achieve my goal.

[Jan Konecny]

Hello, MichaelS.
I have the very same problem. I have already tried to ask for explanation of the parameters at topic viewtopic.php?t=46123 but without success.
But I am still trying to investigate it (and has been doing so for a recent year).
If I do any progress, I will describe and explain it at the topic mentioned above.
Best wishes, Yours sincerelly
Jan Konečný.