B4J Code Snippet Read data from a temperature sensor connected to Home Assistant on Raspberry Pi

I am using Home Assistant installed on a Raspberry Pi, and I have temperature sensors transmitting temperature values to Home Assistant.
Home Assistant has a REST API that may be used by a B4J application to get access to the temperature values.
Documentation about Home Assistant REST API:
https://developers.home-assistant.io/docs/api/rest
See section GET /api/states/<entity_id>.

Example of JSON string received from Home Assistant, where "state" is the temperature:
{"entity_id": "sensor.xxxxxxxxxx_temperature", "state": "-1.06", "attributes": {"state_class": "measurement", "battery": 86, "humidity": 67.3, "linkquality": 57, "pressure": 1033.8, "temperature": -1.06, "voltage": 2975, "unit_of_measurement": "\u00b0C", "device_class": "temperature", "friendly_name": "XXXXXXXXXXX temperature"}, "last_changed": "2021-12-20T23:23:29.434520+00:00", "last_updated": "2021-12-20T23:23:29.434520+00:00", "context": {"id": "xxxxxxxxxxxxxxxxxxx", "parent_id": null, "user_id": null}}

You need following libraries in B4J:
- jOkHttpUtils2
- Json

Example of code in B4J:

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
    Private xui As XUI
    
    ' TextFields used to show temperatures
    Dim txtTempBath As TextField
    Dim txtTempExt As TextField
    
    ' Local IP address of Raspberry Pi with Home Assistant
    Dim sIpHomeAssistant As String = "http://192.168.0.xxx"  ' <<< Type your own IP address
    Dim sPortHomeAssistant As String = "8123"
    ' Token to get access to Home Assistant
    Dim sTokenHA As String = "xxxxxxxxxxxxxxxxxxxxxxxxxx"  ' <<< Type your own token, generated from your profile in Home Assistant
    
    ' Entities in Home Assistant
    Dim sEntityId_TEMP_EXT As String = "sensor.xxxxxxxxxxx_temperature"  ' <<< Type your own entity ID from Home Assistant
    Dim sEntityId_TEMP_BATH As String = "sensor.xxxxxxxxxxx_temperature"
        
    ' Timer to update temperatures at regular intervals
    Dim tmrUpdateStates As Timer
    
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.RootPane.LoadLayout("Layout1")
    MainForm.Show
    
    ' Initialize timer to update temperatures
    tmrUpdateStates.Initialize("tmrUpdateStates",  5 * DateTime.TicksPerSecond)  ' 5000 ms
    tmrUpdateStates.Enabled = True
    ' => See automatic timer event in Sub tmrUpdateStates_Tick
End Sub

' Automatic timer event every 5 seconds
Sub tmrUpdateStates_Tick
    'Handle tick events
    
    ' Get external temperature and show in text field txtTempExt
    SendGetRequestToHomeAssistant(sIdentityId_TEMP_EXT, txtTempExt)
    
    ' Get temperature in bathroom and show in text field txtTempBath
    SendGetRequestToHomeAssistant(sIdentityId_TEMP_BATH, txtTempBath)
    
End Sub

Sub SendGetRequestToHomeAssistant(sEntityId As String, txtState As TextField)
    Dim hj As HttpJob
    hj.Initialize("", Me)
    ' GET http://192.168.0.xxx:8123/api/states/sensor.xxxxxxxxxxx_temperature
    hj.Download(sIpHomeAssistant & ":" & sPortHomeAssistant & "/api/states/" & sEntityId)
    hj.GetRequest.SetHeader("Authorization", "Bearer " & sTokenHA)
    
    ' Send GET request and wait for result
    Wait For (hj) JobDone(hj As HttpJob)
    
    If hj.Success Then
        Dim sResult As String = hj.GetString
        Log("hj.GetString: " & sResult)
        ' Extract temperature from JSON ("state": "-1.06")
        Dim jp As JSONParser
        jp.Initialize(sResult)
        Dim mapJson As Map = jp.NextObject
        Dim sState As String = mapJson.Get("state")
        Log("sState: " & sState)
        ' Show temperature in text field
        txtState.Text = sState
        
    Else
        Log("Error: hj.Success ERROR")
        Log("Error: hj.ErrorMessage: " & hj.ErrorMessage)
    End If
    hj.Release
End Sub