Partial fix for mypy issues

providers/spot/sota.py

@@ -94,21 +94,24 @@ class SOTA(HTTPSpotProvider):
             raise ValueError("SOTA API tokens are required. Please log into SOTA in order to spot to it.")
         sig_ref = spot.sig_refs[0].id if spot.sig_refs else ""
         if sig_ref:
+            if not spot.freq:
+                raise ValueError("SOTA API requires a frequency to be set.")
+
             # Split reference into association and summit codes
             ref_split = sig_ref.split("/")
 
             # Figure out a valid mode. Borrowed this from PoLo :)
             # https://github.com/ham2k/app-polo/blob/main/src/extensions/activities/sota/SOTAPostSelfSpot.js
-            mode = spot.mode
-            if mode and mode not in self.VALID_MODES:
-                mode = "Data"
+            mode_str = spot.mode.value if spot.mode else ""
+            if spot.mode and spot.mode not in self.VALID_MODES:
+                mode_str = "Data"
 
             body = {
                 "activatorCallsign": spot.dx_call,
                 "associationCode": ref_split[0],
                 "summitCode": ref_split[1],
                 "frequency": spot.freq / 1000000.0,
-                "mode": mode or "",
+                "mode": mode_str,
                 "callsign": spot.de_call,
                 "comments": spot.comment or "",
                 "type": "TEST",  # todo replatce with NORMAL/QRT once testing complete