reduce calls to revert and reconf

ffac-ssid-changer/luasrc/lib/gluon/ssid-changer/ssid-changer.lua

@@ -143,8 +143,14 @@ end
 
 if status == 'online' then
     log_debug("node is online")
-    os.execute('uci revert wireless && wifi reconf')
-elseif status == 'offline' then
+    -- only revert and reconf if we were offline in the current monitoring timeframe or before
+    -- to reduce impact
+    if off_count > 0 then
+        uci:revert('wireless')
+        os.execute('wifi reconf')
+    end
+elseif status == 'offline' or off_count > 0 then
+    -- either we are offline or the tq is in the variable range and was considered offline before
     log_debug("node is considered offline")
     local first = tonumber(uci:get('ssid-changer', 'settings', 'first') or 5)
     -- set SSID offline, only if uptime is less than FIRST or exactly a multiplicative of switch_timeframe
@@ -165,6 +171,7 @@ elseif status == 'offline' then
                 if owe_ssid then
                     uci:set('wireless', 'owe_radio' .. i, 'enabled', 0)
                 end
+                -- save does not commit
                 uci:save('wireless')
             end
             os.execute('wifi reconf')
@@ -178,6 +185,10 @@ end
 
 if is_switch_time == 0 then
     file = io.open(tmp, 'w')
-    file:write("0")
+    if status == 'offline' then
+        file:write("1")
+    else
+        file:write("0")
+    end
     file:close()
 end