No matter how many elisp variables, only called once DBus method

eaf.el

@@ -731,8 +731,9 @@ Use it as (eaf-bind-key var key eaf-app-keybinding)"
 
 (defun eaf-send-var-to-python ()
   "Send variables defined in `eaf-var-list' to the Python side."
-  (cl-loop for (sym . val) in eaf-var-list
-           do (eaf-call "store_emacs_var" (symbol-name sym) val)))
+  (eaf-call "store_emacs_var"
+            (string-join (loop for (key . value) in eaf-var-list
+                               collect (format "%s,%s" key value)) ":")))
 
 (dbus-register-signal
  :session "com.lazycat.eaf" "/com/lazycat/eaf"

eaf.py

@@ -252,11 +252,13 @@ class EAF(dbus.service.Object):
             if buffer.buffer_id == buffer_id:
                 buffer.handle_input_message(callback_type, callback_result)
 
-    @dbus.service.method(EAF_DBUS_NAME, in_signature="ss", out_signature="")
-    def store_emacs_var(self, var_name, var_value):
-        for buffer in list(self.buffer_dict.values()):
-            buffer.emacs_var_dict[var_name] = var_value
-            buffer.update_settings()
+    @dbus.service.method(EAF_DBUS_NAME, in_signature="s", out_signature="")
+    def store_emacs_var(self, var_dict_string):
+        for var_pair in var_dict_string.split(":"):
+            (var_name, var_value) = var_pair.split(",")
+            for buffer in list(self.buffer_dict.values()):
+                buffer.emacs_var_dict[var_name] = var_value
+                buffer.update_settings()
 
     @dbus.service.signal(EAF_DBUS_NAME)
     def focus_emacs_buffer(self, message):