Configure a custom pattern to determine when debugging server is started with a new debug_server_ready_pattern option

platformio/debug/config/base.py

@@ -130,7 +130,9 @@ class DebugConfigBase:  # pylint: disable=too-many-instance-attributes
 
     @property
     def server_ready_pattern(self):
-        return (self.server or {}).get("ready_pattern")
+        return self.env_options.get(
+            "debug_server_ready_pattern", (self.server or {}).get("ready_pattern")
+        )
 
     def _load_build_data(self):
         data = load_project_ide_data(self.project_config.path, self.env_name)

platformio/debug/process/server.py

@@ -14,6 +14,7 @@
 
 import asyncio
 import os
+import re
 import time
 
 from platformio import fs
@@ -120,7 +121,13 @@ class DebugServerProcess(DebugBaseProcess):
             return self._ready
         ready_pattern = self.debug_config.server_ready_pattern
         if ready_pattern:
-            self._ready = ready_pattern.encode() in data
+            if ready_pattern.startswith("^"):
+                self._ready = re.match(
+                    ready_pattern,
+                    data.decode("utf-8", "ignore"),
+                )
+            else:
+                self._ready = ready_pattern.encode() in data
         return self._ready
 
     def stdout_data_received(self, data):