The API returns false (no exceptions found in the logs).
The API retrieves nearby OLTs based on the provided coordinates and maximum distance.
If any nearby OLT has a free port, or a nearby router has a free port, the API returns false; otherwise, it returns true.
In the SRD platform, logs related to this request can be found under the category "FAD TASK".

Please support to test it in the SRD UI, if possible provide a sample for this use case

What it does:
Searches for nearby network nodes within maxDistance from given GPS coordinates:
1. GPON → searches nearby OLTs with free ports
2. COPPER → searches nearby MDU/MSAN with free ports
3. Both → fallback: searches nearby ATN/CX Routers with free ports
Returns false = FAD not needed (infrastructure found nearby)
Returns true = FAD task must be created (no nearby infrastructure)

How to construct the request:
• requestId → any service request ID (used for logging only, not validated)
• networkType → "GPON" or "COPPER"
• maxDistance → search radius in meters (example 20000.0 = 20km)
• siteLat/siteLong → site GPS coordinates
• coordinateFormat → "geo_wgs84"

<ser:checkFadFeasibility>
<requestId>400</requestId>
<networkType>GPON</networkType>
<maxDistance>20000.0</maxDistance>
<siteLat>25.638</siteLat>
<siteLong>58.24</siteLong>
<coordinateFormat>geo_wgs84</coordinateFormat>
</ser:checkFadFeasibility>

DB confirmed via SRD_REQUEST_LOG:
SELECT MESSAGE, INSERTDATE FROM SRD_REQUEST_LOG
WHERE REQUEST_ID = '400' ORDER BY INSERTDATE DESC;