B4R Code Snippet [ESP32] Internal Hall sensor (magnetic)

According to this post and https://www.esp32.com/viewtopic.php?t=4963 info such code is prepared for practical usage:

Module name 'espinternal':
'espinternal module name
Private Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'Public variables can be accessed from all modules.
    Dim HallOffset As Int = 50    'value to retract from Hall value
    Dim HallMeasurement As Int = 0    'milliTesla output -300...+300 mT under a Neodymium magnet
    Dim Temperature As Float = 0    'non-usable as always around +55 °С
    Private Timer1 As Timer
    Dim Flag_ready As Boolean
End Sub

Sub Start
    Timer1.Initialize("Timer1_Tick", 300)
    Timer1.Enabled = True
End Sub

Private Sub Timer1_Tick
    RunNative("hallread", HallOffset)
    Log("Hall sensor measurement: ", HallMeasurement)
'    Temperature = 0
'    RunNative("Temp",Null)
'    Temperature = (Temperature- 32) / 1.8
'    Log(JoinStrings(Array As String("Internal temperature = ", NumberFormat(Temperature, 0, 2), "°C")))
    Flag_ready = True
End Sub

#If C
void hallread(B4R::Object* o) {
    int i;
    long h;
    int cycles;
    int offset;
    cycles = 300;
    offset = o->toLong();
    h += hallRead();
    h = h / cycles - offset;
    b4r_espinternal::_hallmeasurement = h; //milliTesla output    // raw method: b4r_espinternal::_hallmeasurement=hallRead();
#End If

#if C
#ifdef __cplusplus
extern "C" {
uint8_t temprature_sens_read();
#ifdef __cplusplus
uint8_t temprature_sens_read();
void Temp (B4R::Object* o) {
   //lower case variables
   b4r_espinternal::_temperature=temprature_sens_read(); //also there is temperatureRead() function, but it returns wrong temperature
#End if

Internal temperature is useless, it's always high, as should be.
But magnetic Hall sensor works OK in milliTesla: +/- 300 mT at +/-1 mT tolerance. But the sensor is at the center of ESP32 module, so it's very important to move the magnet source very close to the center.
If 1...2 cm higher - no sensing already.