sonoff-diy: add powershell commands (tasmota#1388)

docs/Sonoff-DIY.md

@@ -32,12 +32,18 @@ Note: I needed to manually change IP address to 10.10.7.2, 255.0.0.0 with gatewa
 2. Use Fing or any similar local network scanning app on your smartphone or PC to find IP address of your Sonoff Mini device. MAC Vendor most likely is **Espressif** and the device has **8081** port open.
 3. Check that diy mode is working properly.
 
-`$SONOFF_IP` must be defined with the IP or FQDN of the intended Sonoff device before running the `curl` command. With curl:
+`$SONOFF_IP` must be defined with the IP or FQDN of the intended Sonoff device before running the `curl` command. With curl or with PowerShell (Windows):
 ```sh
+# curl
 SONOFF_IP="10.0.0.2"
 curl -XPOST --header "Content-Type: application/json" --data-raw '{"deviceid": "", "data": {}}' http://$SONOFF_IP:8081/zeroconf/info
 ```
 
+```pwsh
+# powershell
+$SONOFF_IP='10.0.0.2'
+Invoke-RestMethod -Method POST -Body '{"deviceid": "", "data": {}}' -Uri "http://$($SONOFF_IP):8081/zeroconf/info" | ConvertTo-Json
+```
 
 <details>
 <summary> Or with the Rester browser extension:</summary>  
@@ -75,12 +81,18 @@ If all is OK, status code *200* should be returned with bunch of data:
 If that doesn't return *200*, try going back to 5s+5s reset above.
 4. If all above works, let's unlock OTA:
 
-With curl:
+With curl or PowerShell (Windows):
 
 ```sh
+# curl
 curl -XPOST --header "Content-Type: application/json" --data-raw '{"deviceid": "", "data": {}}' http://$SONOFF_IP:8081/zeroconf/ota_unlock
 ```
 
+```pwsh
+# powershell
+Invoke-RestMethod -Method POST -Body '{"deviceid": "", "data": {}}' -Uri "http://$($SONOFF_IP):8081/zeroconf/ota_unlock" | ConvertTo-Json
+```
+
 <details>
 <summary> Or with the Rester browser extension:</summary> 
 
@@ -95,14 +107,40 @@ curl -XPOST --header "Content-Type: application/json" --data-raw '{"deviceid": "
 Optionally for curiosity you could retry *info* query to check if *otaUnlock* value now is *true*
 5. Download the appropriate binary from <http://ota.tasmota.com/tasmota/release> and flash it. *NOTE: The maximum firmware size is 508kb, which precludes the standard release binary.* Absolutely do not use tasmota-minimal at this stage, this would brick your device.
 
-There are a number of [reported](https://github.com/itead/Sonoff_Devices_DIY_Tools/issues/10) [issues](https://github.com/itead/Sonoff_Devices_DIY_Tools/issues/95) with the stock firmware's OTA behavior, so it may be easier to use [an existing server](http://sonoff-ota.aelius.com/) that works around these issues.  
-`$HASH` must be defined with the `sha256sum` of the intended firmware file (the `.bin` file) before running the `curl` command.  
+!!! There are a number of [reported](https://github.com/itead/Sonoff_Devices_DIY_Tools/issues/10) [issues](https://github.com/itead/Sonoff_Devices_DIY_Tools/issues/95) with the stock 
+    firmware's OTA behavior, so it may be easier to use [an existing server](http://sonoff-ota.aelius.com/) that works around these issues.  
+
+!!! Please note: if you have 3.5.0 or 3.6.0 firmware, maybe others (see version in `/info` response), firmware has a bug: it connects to specified server, but always sends dl.itead.cn as server name.
+    That is why you have to update from server that supports serving files with server name `dl.itead.cn`
+    * `ota.tasmota.com` is NOT suitable for this.
+    * Use `sonoff-ota.aelius.com` or set up your local web server
+
+`$HASH` must be defined with the `sha256sum` of the intended firmware file (the `.bin` file) before running the `curl` command. 
+If using PowerShell, it is not necessary.
+!!! There are a number of [reported](https://github.com/itead/Sonoff_Devices_DIY_Tools/issues/10) [issues](https://github.com/itead/Sonoff_Devices_DIY_Tools/issues/95) with the stock 
+    firmware's OTA behavior, so it may be easier to use [an existing server](http://sonoff-ota.aelius.com/) that works around these issues.  
+
+!!! Please note: if you have 3.5.0 or 3.6.0 firmware, maybe others (see version in `/info` response), firmware has a bug: it connects to specified server, but always sends dl.itead.cn as server name.
+    That is why you have to update from server that supports serving files with server name `dl.itead.cn`
+    * `ota.tasmota.com` is NOT suitable for this.
+    * Use `sonoff-ota.aelius.com` or set up your local web server
+
+`$HASH` must be defined with the `sha256sum` of the intended firmware file (the `.bin` file) before running the `curl` command. 
+If using PowerShell, it is not necessary.
 For example:
 ```sh
+# curl
 HASH="5c1aecd2a19a49ae1bec0c863f69b83ef40812145c8392eebe5fd2677a6250cc"
 curl -XPOST --data "{\"deviceid\":\"\",\"data\":{\"downloadUrl\": \"http://sonoff-ota.aelius.com/tasmota-latest-lite.bin\", \"sha256sum\": \"$HASH\"} }" http://$SONOFF_IP:8081/zeroconf/ota_flash
 ```
 
+```pwsh
+# powershell
+$FW_URL = 'http://sonoff-ota.aelius.com/tasmota-latest-lite.bin'
+$HASH = [BitConverter]::ToString([System.Security.Cryptography.SHA256]::Create().ComputeHash([System.Net.WebClient]::new().DownloadData($FW_URL))).Replace('-','').ToLower()
+Invoke-RestMethod -Method POST -Body ('{"deviceid":"","data":{"downloadUrl": "' + $FW_URL + '", "sha256sum": "' + $HASH +'"} }') -Uri "http://$($SONOFF_IP):8081/zeroconf/ota_flash" | ConvertTo-Json
+```
+
 <details>
 <summary> Or with the Rester browser extension:</summary>  
 
@@ -114,7 +152,9 @@ curl -XPOST --data "{\"deviceid\":\"\",\"data\":{\"downloadUrl\": \"http://sonof
 	6. You should get status code *200*
 </details>
 
-**Note:** If flashing is successful, a new **ITEAD-XXXXXXXX** access point will be created.  
+!!! Flashing can take up to few minutes, as device downloads firmware part-by-part. There is high risk of bricking device if you reboot it or if internet connection fails.
+
+**Note:** If flashing is successful, a new **tasmota-XXXXXXXX** access point will be created.  
 Connect to this AP to configure Tasmota to connect to your WiFi network. 
 
 You're now ready to [configure tasmota](https://tasmota.github.io/docs/Getting-Started/#using-web-ui).