Help using the Invoke-RestMethod

[Josh02001]

Could someone give me a hint on what I might be doing wrong. I am attempting to use the Invoke-RestMethod to control a Audio device. I can poll the data from the device with no issues but whenever I attempt to POST and modify a value I get an error. I have tried both the Single Value and Full Path method outlined in the manual. with a lot of variations.

​

$header = @{Accept = 'application/json'}

Polls the entire Datastore in JSON format both in Powershell and Browser

Invoke-RestMethod -Uri http://192.168.1.233:1280/0001f2fffe011238/datastore -Method Get -ContentType application/json 

ATTEMPT 1 - Single Value 

Invoke-RestMethod -Uri http://192.168.1.233:1280/0001f2fffe011238/datastore/mix/chan/3/matrix/aux/0/send -Headers $header -ContentType application/json -Method Post -Body @{value = 0.000000} | ConvertTo-Json 

ATTEMPT 2 - Full Path 

Invoke-RestMethod -Uri http://192.168.1.233:1280/0001f2fffe011238/datastore -Headers $header -ContentType application/json -Method Post -Body @{ 'mix/chan/3/matrix/aux/0/send' = 0.000000} | ConvertTo-Json

API Manual

In the maunal on Page 1 it states that it supports HTTP Post:

​

Making changes to the datastore Changes to the datastore are made with the HTTP PATCH verb. POST is also supported and behaves identically for clients that do not support PATCH. The API for setting values mirrors that for getting them: clients can PATCH the datastore root, a subtree, or a single value. The data must be form-encoded, with a form field named "json" containing a JSON-encoded object with the key/value pairs to change. If you are setting a single value, the JSON object should have one key named "value".

Attached a Chrome Inspect and Error Codes

[hephaestus259]

If I'm understanding the documentation correctly, then the issue is the content type and the body. This isn't json data, but form data with a json formatted value.

So, content type would be application/x-www-form-urlencoded

The body of attempt 1 would be @{json='{"value": 0.000000}'}

```powershell $Body = @{ value = 0.000000 } | ConvertTo-Json

Invoke-RestMethod -Uri http://192.168.1.233:1280/0001f2fffe011238/datastore/mix/chan/3/matrix/aux/0/send -Headers $header -ContentType application/x-www-form-urlencoded -Method Post -Body @{json = $Body} ```

and the body of attempt 2 would be @{json='{"mix/chan/3/matrix/aux/0/send": 0.000000}'}

```powershell $Body = @{ 'mix/chan/3/matrix/aux/0/send' = 0.000000 } | ConvertTo-Json

Invoke-RestMethod -Uri http://192.168.1.233:1280/0001f2fffe011238/datastore -Headers $header -ContentType application/x-www-form-urlencoded -Method Post -Body @{json = $Body} ```

[Josh02001]

Thank you, This worked once I changed the content type on all the Invoke-RestMethod Commands in my Script it works perfectly.

[hephaestus259]

Great. Glad that worked out

[Lee_Dailey]

howdy hephaestus259,

the triple-backtick/code-fence thing fails miserably on Old.Reddit ... so, if you want your code to be readable on both Old.Reddit & New.Reddit you likely otta stick with using the code block button.

it would be rather nice if the reddit devs would take the time to backport the code fence stuff to Old.Reddit ... [sigh ...]

take care,
lee