Sending Messages with Rest API

Question

Is there a way to send REST API calls in AVEVA System Platform & OMI? I have seen some documentation on Rest API for Recipe Management and don't know if/how that would help me in this situation. After a button is clicked, I want to send a rest message with HTTP Post.

Richard Köhlerstrand · Accepted Answer

Hi Caroline, 
 As Adam suggest, the WEBSVC will allow you to do connections to webservice and get or set data and presenting it in a OI Driver like way. 
 Funneling the data into datapoints you could use in your objects. 
 
 But there is also possible to do this using scripting, the following example will utilize a RestSharp.dll and the newtonsoft library for working with json 
 'REST API Call
dim client as RestSharp.RestClient;
dim request as RestSharp.RestRequest;
dim response as RestSharp.RestResponse;

client = new RestSharp.RestClient("http://api.openweathermap.org/data/2.5/forecast?q=London&mode=json&units=imperial&cnt=7&appid=3b8af615471033987fdaa4bf2ef93231");
client.Timeout = -1;
'System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Ssl3 |System.Net.SecurityProtocolType.Tls | System.Net.SecurityProtocolType.Tls11 | System.Net.SecurityProtocolType.Tls12 | System.Net.SecurityProtocolType.Tls13;
request = new RestSharp.RestRequest(RestSharp.Method.GET);
response = client.Execute(request);
LogError(response.Content);

Me.Result = response.Content;

'JSON String parsing
dim jinstance as Newtonsoft.Json.Linq.JObject;
dim jarray1 as Newtonsoft.Json.Linq.JArray;

jinstance = Newtonsoft.Json.Linq.JObject.Parse(response.Content);
jarray1 = Newtonsoft.Json.Linq.JArray.FromObject(jinstance["list"]);


'Assign values to Attibutes
dim i as integer;
for i = 0 to jarray1.Count - 1 step 1
	Me.Humidity.Value[i + 1] = jarray1[i]["main"]["humidity"];
	LogMessage(Me.Humidity.Value);
	Me.Temperature.Max[i + 1] = jarray1[i]["main"]["temp_min"];
	Me.Temperature.Min[i + 1] = jarray1[i]["main"]["temp_max"];

next;
Me.Run = false; 
 I have some additional examples and files, but reach out to me (contact info in my profile) and I can send you some example files if you find it valuable.

Sending Messages with Rest API

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