B4R Question MQTT issue

' In Process Globals
Dim host As String="192.168.4.1"
Dim myName As String="prova"
Dim port As Int = 1883

'Line 31'
client.Initialize("client", $"tcp://${MQTThost}:${port}"$, myName)

#Region Project Attributes
    #AutoFlushLogs: True
    #CheckArrayBounds: True
    #StackBufferSize: 600
#End Region
'Ctrl+Click to open the C code folder: ide://run?File=%WINDIR%\System32\explorer.exe&Args=%PROJECT%\Objects\Src

Sub Process_Globals
    Public Serial1 As Serial
    Private wifi As ESP8266WiFi
    Public client As MqttClient
    Public connected As Boolean
    Public client As MqttClient
    Dim host As String="0ed834272c314afea7aae83a2d027e0d.s1.eu.hivemq.cloud"
    Dim myName As String="prova"
    Dim port As Int = 8883
End Sub


Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    'example of connecting to a local network
    If wifi.Connect2("wifi-net", "pwd") Then
        Log("Connected to network")
    Else
        Log("Failed to connect to network")
    End If
    
    
End Sub

Sub ConnectMQTT
    client.Initialize("client", host, port, myName)
    Dim options As MqttConnectOptions
    options.Initialize("user", "password")
    client.Connect2(options)
    
End Sub

Sub client_Connected (Success As Boolean)
    connected = Success
    If Success Then
        Log("CONNESSO")
    Else
        Log("NON CONNESSO")
    End If
    
End Sub

Sub client_Disconnected
    connected = False
    Log("Disconnesso mqtt")
    'CallSub(Main, "SetState")
End Sub

Sub client_MessageArrived (Topic As String, Payload() As Byte)
    
End Sub



Sub Service_TaskRemoved
    'This event will be raised when the user removes the app from the recent apps list.
End Sub

'Return true to allow the OS default exceptions handler to handle the uncaught exception.

Sub Service_Destroy

End Sub

Sub Process_Globals
    Public Serial1 As Serial
    Private wifi As ESP8266WiFi
    Public client As MqttClient                                        <= is defined twice!!!!
    Public connected As Boolean
    Public client As MqttClient
    Dim host As String="0ed834272c314afea7aae83a2d027e0d.s1.eu.hivemq.cloud"
    Dim myName As String="prova"
    Dim port As Int = 8883
End Sub