B4J Question MQTT connection setup

[hakha4]

I try to connect to a Mqtt broker online (https://about.gbridge.io/) that works like a bridge against Google home. The connection info is as below:
Hostname: mqtt.gbridge.io
Port: 8883
Username: Shown in your account’s dashboard under “My Account”
Password: Is your account’s password by default, but can be changed independently.
TLS: TLS V1.2 is required

Code:

AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.SetFormStyle("UNIFIED")
    MainForm.RootPane.LoadLayout("1") 'Load the layout file.
    MainForm.Show
 
    Dim clientId As String = Rnd(0, 999999999) & DateTime.Now 'create a unique id
    Dim mo As MqttConnectOptions
    mo.Initialize(user, password)' set in  Process_Globals
    Dim jo As JavaObject = mo


    'jo.RunMethod("SetSSLProperties",?)' how to set 'TLS' true ???
 
    mqtt.Initialize("mqtt", "mqtt.gbridge.io:8883", clientId)
 
 
    mqtt.Connect2(mo)
    mytopic = "gBridge/xxxx/xxxx/onoff" & mqtt.ClientId
    StatusBar1.Initialize("StatusBar1")
    MainForm.RootPane.AddNode(StatusBar1, 0, 0, -1, 30)
    MainForm.RootPane.SetAnchors(StatusBar1, 0, -1, 0, 0)

End Sub

If I run code without taking 'TLS' into account I get java.lang.NullPointerException ....... at mqtt.initialize line. I don't know how to set the SSL property but when trying with NULL (jo.RunMethod("SetSSLProperties",NULL)) it throws error: java.lang.RuntimeException: Method: SetSSLProperties not found in: org.eclipse.paho.client.mqttv3.MqttConnectOptions.

Can someone help me pointing out how to set properties correct in MqttConnectOptions ? I have not found enough information in forum to solve this by myself. What basic is wrong in connection code ? It would be nice to get a bridge to Google home!
Regards Håkan

Sorry, posted in WRONG forum by mistake, should have been B4J. Don't know how to change that

 

[Erel]

 mqtt.Initialize("mqtt", "ssl://mqtt.gbridge.io:8883", clientId)

 

[hakha4]

Thank's. Run's without error now but complain's about missing certificate ((SunCertPathBuilderException) sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target). I'll try to solve that.

 

[Erel]

https://www.b4x.com/android/forum/threads/b4x-mqtt-ssl-and-self-signed-certificates.100973/#content

 

[hakha4]

Perfect