Enable Windows 10 built-in hotspot by cmd/batch/powershell

Based on the PowerShell comment above,

Here are the WinRT code components for mix/match to accomplish the above tasks for WiFi Direct 2.0 HotSpot activities using C++ without dependencies on other tooling etc (they work on IoT Core, etc):

• Programmatically set the SSID and/or PassPhrase
• Programmatically query the current WiFi Direct 2.0 HotSpot status
• Programmatically turn on/off the WiFi Direct 2.0 HotSpot

#include <winrt/Windows.Networking.Connectivity.h>
#include <winrt/Windows.Networking.NetworkOperators.h>
namespace winrt { // /ZW embed in :<winrt> when `Windows` is ambiguously defined
  static void af_winrt_wifi_hotspot_test() {
    // start ms-settings:network-mobilehotspot
    init_apartment(); // apartment_type::multi_threaded
    auto connectionProfile { Windows::Networking::Connectivity::NetworkInformation::GetInternetConnectionProfile() };
    auto tetheringManager = Windows::Networking::NetworkOperators::NetworkOperatorTetheringManager::CreateFromConnectionProfile(connectionProfile);
    switch(tetheringManager.TetheringOperationalState()) {
      case Windows::Networking::NetworkOperators::TetheringOperationalState::Off: {
          auto ioAsync = tetheringManager.StartTetheringAsync();
          auto fResult = ioAsync.get();
        }
        break;
      case Windows::Networking::NetworkOperators::TetheringOperationalState::On: {
          auto ioAsync = tetheringManager.StopTetheringAsync();
          auto fResult = ioAsync.get();
        }
        break;
      case Windows::Networking::NetworkOperators::TetheringOperationalState::InTransition:
      default:
        break;
    }
    clear_factory_cache();
    uninit_apartment();
  }
}

TL;DR:
If anyone is interested, I've created a batch file using the above solution to turn on the Mobile Hotspot. Simply create a new .bat file and paste the following code inside:

@echo off
powershell.exe -encodedCommand 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

(Although it's trivial to say, I'll remind you that the above code will also work as a CMD command).

Explanation:
What I did is to take the following PowerShell script (given in above answers by Julius Hardt), and convert it to a batch file using this converter:

[Windows.System.UserProfile.LockScreen,Windows.System.UserProfile,ContentType=WindowsRuntime] | Out-Null
Add-Type -AssemblyName System.Runtime.WindowsRuntime
$asTaskGeneric = ([System.WindowsRuntimeSystemExtensions].GetMethods() | ? { $_.Name -eq 'AsTask' -and $_.GetParameters().Count -eq 1 -and $_.GetParameters()[0].ParameterType.Name -eq 'IAsyncOperation`1' })[0]
Function Await($WinRtTask, $ResultType) {
    $asTask = $asTaskGeneric.MakeGenericMethod($ResultType)
    $netTask = $asTask.Invoke($null, @($WinRtTask))
    $netTask.Wait(-1) | Out-Null
    $netTask.Result
}
Function AwaitAction($WinRtAction) {
    $asTask = ([System.WindowsRuntimeSystemExtensions].GetMethods() | ? { $_.Name -eq 'AsTask' -and $_.GetParameters().Count -eq 1 -and !$_.IsGenericMethod })[0]
    $netTask = $asTask.Invoke($null, @($WinRtAction))
    $netTask.Wait(-1) | Out-Null
}
$connectionProfile = [Windows.Networking.Connectivity.NetworkInformation,Windows.Networking.Connectivity,ContentType=WindowsRuntime]::GetInternetConnectionProfile()
$tetheringManager = [Windows.Networking.NetworkOperators.NetworkOperatorTetheringManager,Windows.Networking.NetworkOperators,ContentType=WindowsRuntime]::CreateFromConnectionProfile($connectionProfile)

# Be sure to include Ben N.'s await for IAsyncOperation:
# https://superuser.com/questions/1341997/using-a-uwp-api-namespace-in-powershell

# Check whether Mobile Hotspot is enabled
$tetheringManager.TetheringOperationalState

# Start Mobile Hotspot
Await ($tetheringManager.StartTetheringAsync()) ([Windows.Networking.NetworkOperators.NetworkOperatorTetheringOperationResult])

I've also put this batch file inside the startup folder located in "C:\Users\<USERNAME>\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup" so the Mobile Hotspot will turn on automatically upon Windows startup.

To toggle the Mobile Hotspot ON\OFF, I've modified the above answer (by Julius Hardt) to this:

[Windows.System.UserProfile.LockScreen,Windows.System.UserProfile,ContentType=WindowsRuntime] | Out-Null
Add-Type -AssemblyName System.Runtime.WindowsRuntime
$asTaskGeneric = ([System.WindowsRuntimeSystemExtensions].GetMethods() | ? { $_.Name -eq 'AsTask' -and $_.GetParameters().Count -eq 1 -and $_.GetParameters()[0].ParameterType.Name -eq 'IAsyncOperation`1' })[0]
Function Await($WinRtTask, $ResultType) {
    $asTask = $asTaskGeneric.MakeGenericMethod($ResultType)
    $netTask = $asTask.Invoke($null, @($WinRtTask))
    $netTask.Wait(-1) | Out-Null
    $netTask.Result
}
Function AwaitAction($WinRtAction) {
    $asTask = ([System.WindowsRuntimeSystemExtensions].GetMethods() | ? { $_.Name -eq 'AsTask' -and $_.GetParameters().Count -eq 1 -and !$_.IsGenericMethod })[0]
    $netTask = $asTask.Invoke($null, @($WinRtAction))
    $netTask.Wait(-1) | Out-Null
}

$connectionProfile = [Windows.Networking.Connectivity.NetworkInformation,Windows.Networking.Connectivity,ContentType=WindowsRuntime]::GetInternetConnectionProfile()
$tetheringManager = [Windows.Networking.NetworkOperators.NetworkOperatorTetheringManager,Windows.Networking.NetworkOperators,ContentType=WindowsRuntime]::CreateFromConnectionProfile($connectionProfile)

# Be sure to include Ben N.'s await for IAsyncOperation:
# https://superuser.com/questions/1341997/using-a-uwp-api-namespace-in-powershell

# Check whether Mobile Hotspot is enabled
$tetheringManager.TetheringOperationalState

# If Mobile Hotspot is on - turn it off.
if ($tetheringManager.TetheringOperationalState -eq 1){
    # Stop Mobile Hotspot
    Await ($tetheringManager.StopTetheringAsync()) ([Windows.Networking.NetworkOperators.NetworkOperatorTetheringOperationResult])
}
# If Mobile Hotspot is off - turn it on.
else{
    # Start Mobile Hotspot
    Await ($tetheringManager.StartTetheringAsync()) ([Windows.Networking.NetworkOperators.NetworkOperatorTetheringOperationResult])
}

The corresponding batch file:

@echo off
powershell.exe -encodedCommand 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

The Hosted Network (which can be configured using the netsh wlan set hostednetwork ... command) and the "new" Mobile Hotspot use different technologies under the hood.

There's a WinRT API to control and configure the "new" mobile hotspot you're referring to. You can call it from PowerShell:

The following code snippet requires Ben N.'s await function for IAsyncOperation and IAsyncAction in PowerShell, which can be found here.

$connectionProfile = [Windows.Networking.Connectivity.NetworkInformation,Windows.Networking.Connectivity,ContentType=WindowsRuntime]::GetInternetConnectionProfile()
$tetheringManager = [Windows.Networking.NetworkOperators.NetworkOperatorTetheringManager,Windows.Networking.NetworkOperators,ContentType=WindowsRuntime]::CreateFromConnectionProfile($connectionProfile)

# Be sure to include Ben N.'s await for IAsyncOperation:
# https://superuser.com/questions/1341997/using-a-uwp-api-namespace-in-powershell

# Check whether Mobile Hotspot is enabled
$tetheringManager.TetheringOperationalState

# Start Mobile Hotspot
Await ($tetheringManager.StartTetheringAsync()) ([Windows.Networking.NetworkOperators.NetworkOperatorTetheringOperationResult])

# Stop Mobile Hotspot
Await ($tetheringManager.StopTetheringAsync()) ([Windows.Networking.NetworkOperators.NetworkOperatorTetheringOperationResult])

The NetworkOperatorTetheringManager class also allows you to set the SSID and the passphrase of your hotspot programmatically.