--- a/sat/memory/params.py	Wed Sep 25 08:53:38 2019 +0200
+++ b/sat/memory/params.py	Wed Sep 25 08:56:41 2019 +0200
@@ -529,17 +529,18 @@
 
         return d.addCallback(gotPlainPassword)
 
-    def __type_to_string(self, result):
-        """ convert result to string, according to its type """
+    def _type_to_str(self, result):
+        """Convert result to string, according to its type """
         if isinstance(result, bool):
-            return "true" if result else "false"
-        elif isinstance(result, int):
+            return C.boolConst(result)
+        elif isinstance(result, (list, set, tuple)):
+            return ', '.join(self._type_to_str(r) for r in result)
+        else:
             return str(result)
-        return result
 
     def getStringParamA(self, name, category, attr="value", profile_key=C.PROF_KEY_NONE):
         """ Same as getParamA but for bridge: convert non string value to string """
-        return self.__type_to_string(
+        return self._type_to_str(
             self.getParamA(name, category, attr, profile_key=profile_key)
         )
 
@@ -599,15 +600,10 @@
             return self._getAttr(node[1], attr, value)
 
     def asyncGetStringParamA(
-        self,
-        name,
-        category,
-        attr="value",
-        security_limit=C.NO_SECURITY_LIMIT,
-        profile_key=C.PROF_KEY_NONE,
-    ):
+        self, name, category, attr="value", security_limit=C.NO_SECURITY_LIMIT,
+        profile_key=C.PROF_KEY_NONE):
         d = self.asyncGetParamA(name, category, attr, security_limit, profile_key)
-        d.addCallback(self.__type_to_string)
+        d.addCallback(self._type_to_str)
         return d
 
     def asyncGetParamA(
@@ -957,14 +953,8 @@
                 categories.append(cat.getAttribute("name"))
         return categories
 
-    def setParam(
-        self,
-        name,
-        value,
-        category,
-        security_limit=C.NO_SECURITY_LIMIT,
-        profile_key=C.PROF_KEY_NONE,
-    ):
+    def setParam(self, name, value, category, security_limit=C.NO_SECURITY_LIMIT,
+                 profile_key=C.PROF_KEY_NONE):
         """Set a parameter, return None if the parameter is not in param xml.
 
         Parameter of type 'password' that are not the SàT profile password are
@@ -994,13 +984,11 @@
             return defer.succeed(None)
 
         if not self.checkSecurityLimit(node[1], security_limit):
-            log.warning(
-                _(
-                    "Trying to set parameter '%(param)s' in category '%(cat)s' without authorization!!!"
-                    % {"param": name, "cat": category}
-                )
-            )
-            return defer.succeed(None)
+            msg = _(
+                f"{profile!r} is trying to set parameter {name!r} in category "
+                f"{category!r} without authorization!!!")
+            log.warning(msg)
+            raise exceptions.PermissionError(msg)
 
         type_ = node[1].getAttribute("type")
         if type_ == "int":
@@ -1010,12 +998,10 @@
                 try:
                     int(value)
                 except ValueError:
-                    log.debug(
-                        _(
-                            "Trying to set parameter '%(param)s' in category '%(cat)s' with an non-integer value"
-                            % {"param": name, "cat": category}
-                        )
-                    )
+                    log.warning(_(
+                        f"Trying to set parameter {name!r} in category {category!r} with"
+                        f"an non-integer value"
+                    ))
                     return defer.succeed(None)
                 if node[1].hasAttribute("constraint"):
                     constraint = node[1].getAttribute("constraint")