--- a/Beremiz_service.py	Wed Dec 11 09:30:07 2024 +0100
+++ b/Beremiz_service.py	Thu Dec 12 11:33:08 2024 +0100
@@ -226,6 +226,7 @@
         import wx.adv
 
         app = wx.App(redirect=False)
+        app.GTKSuppressDiagnostics()
         app.SetTopWindow(wx.Frame(None, -1))
 
         default_locale = None

--- a/svghmi/svghmi.py	Wed Dec 11 09:30:07 2024 +0100
+++ b/svghmi/svghmi.py	Thu Dec 12 11:33:08 2024 +0100
@@ -326,6 +326,7 @@
           <xsd:attribute name="OnStart" type="xsd:string" use="optional" default="%(launch)s"/>
           <xsd:attribute name="OnStop" type="xsd:string" use="optional" default=""/>
           <xsd:attribute name="OnWatchdog" type="xsd:string" use="optional" default="%(watchdog)s"/>
+          <xsd:attribute name="SuppressBrowserOutput" type="xsd:boolean" use="optional" default="true"/>
           <xsd:attribute name="EnableWatchdog" type="xsd:boolean" use="optional" default="false"/>
           <xsd:attribute name="WatchdogInitial" use="optional" default="30">
             <xsd:simpleType>
@@ -641,13 +642,13 @@
         res += ((target_fname, open(target_path, "rb")),)
 
         svghmi_cmds = {}
+        suppress_output = not(self.GetParamsAttributes("SVGHMI.SuppressBrowserOutput")["value"])
+        stdstream = "subprocess.DEVNULL" if suppress_output else "None"
         for thing in ["Start", "Stop", "Watchdog"]:
              given_command = self.GetParamsAttributes("SVGHMI.On"+thing)["value"]
              args = shlex.split(given_command.format(**svghmi_options))
-             svghmi_cmds[thing] = (
-                "Popen(" +
-                repr(args) +
-                ")") if args else "None # no command given"
+             svghmi_cmds[thing] = f"Popen({repr(args)}, stdout={stdstream},stderr={stdstream})" \
+                                  if args else "None # no command given"
 
         runtimefile_path = os.path.join(buildpath, "runtime_%s_svghmi_.py" % location_str)
         runtimefile = open(runtimefile_path, 'w')
@@ -657,6 +658,8 @@
 
 # generated by beremiz/svghmi/svghmi.py
 
+import subprocess
+
 browser_proc = None
 
 def svghmi_{location}_watchdog_trigger():