Fix MQTT FullTopic with URL-encoded leading space

- Devices had FullTopic starting with %20 (URL-encoded space)
- This breaks MQTT topic publishing with invalid leading space
- Now detects %20 prefix and forces update even if normalized values match
- Properly URL-encodes all MQTT setting values when sending
- FullTopic %prefix%/%topic%/ now encoded as %25prefix%25%2F%25topic%25%2F
- Fixes MQTT topics showing as '%20stat/device/...' instead of 'stat/device/...'

configuration.py

@@ -226,6 +226,9 @@ class ConfigurationManager:
             
             self.logger.debug(f"{device_name}: Raw FullTopic from device: '{current_full_topic}'")
 
+            # Check if device has URL-encoded spaces at the beginning (broken state)
+            has_leading_encoded_space = current_full_topic.startswith('%20')
+
             # Normalize: remove any URL-encoded spaces from the beginning of current value
             # This handles the case where the device returns '%20%prefix%' instead of '%prefix%'
             while current_full_topic.startswith('%20'):
@@ -236,7 +239,10 @@ class ConfigurationManager:
 
             self.logger.debug(f"{device_name}: Comparing FullTopic: current='{current_full_topic}' vs expected='{mqtt_full_topic_normalized}'")
 
-            if current_full_topic != mqtt_full_topic_normalized:
+            # Update if values don't match OR if device had leading encoded space (needs fixing)
+            if current_full_topic != mqtt_full_topic_normalized or has_leading_encoded_space:
+                if has_leading_encoded_space:
+                    self.logger.info(f"{device_name}: FullTopic has invalid leading space, will fix")
                 updates_needed.append(('FullTopic', mqtt_full_topic_normalized))
 
         # Handle NoRetain (SetOption62)
@@ -255,7 +261,13 @@ class ConfigurationManager:
     
         failed_updates = []
         for setting_name, setting_value in updates_needed:
-            command = f"{setting_name}%20{setting_value}"
+            # URL encode the value, especially important for FullTopic which contains % and /
+            from urllib.parse import quote
+            # Convert value to string and URL encode it
+            encoded_value = quote(str(setting_value), safe='')
+            command = f"{setting_name}%20{encoded_value}"
+
+            self.logger.debug(f"{device_name}: Sending command: {command}")
 
             result, success = retry_command(
                 lambda: send_tasmota_command(device_ip, command, timeout=5, logger=self.logger),