Device REST - Testing

Async

The best way to test this service with simulated data is to use PostMan to send data to the following endpoints defined for the above device profiles.

• http://localhost:59986/api/v2/resource/sample-image/jpeg

  • POSTing a JPEG binary image file will result in the BinaryValue of the Reading being set to the JPEG image data posted.
  • Example test JPEG to post:
    • Select any JPEG file from your computer or the internet

• http://localhost:59986/api/v2/resource/sample-image/png

  • POSTing a PNG binary image file will result in the BinaryValue of the Reading being set to the PNG image data posted.
  • Example test PNG to post:
    • Select any PNG file from your computer or the internet

• http://localhost:59986/api/v2/resource/sample-json/json

  • POSTing a JSON string value will result in the Value of the Reading being set to the JSON string value posted.

  Note: Currently there isn't a JSON data type, thus there is no validation that the string value is valid JSON. It is up to the Application Service using the JSON to first validate it.

  • Example test JSON value to post:

  {
      "id" : "1234",
      "name" : "test data",
      "payload" : "test payload"
  }
  

• http://localhost:59986/api/v2/resource/sample-numeric/int

  • POSTing a text integer value will result in the Value of the Reading being set to the string representation of the value as an Int64. The POSTed value is verified to be a valid Int64 value.

  • A 400 error will be returned if the POSTed value fails the Int64 type verification.

  • Example test int value to post:

  1001
  

• http://localhost:59986/api/v2/resource/sample-numeric/float

  • POSTing a text float value will result in the Value of the Reading being set to the string representation of the value as an Float64. The POSTed value is verified to be a valid Float64 value.

  • A 400 error will be returned if the POSTed value fails the Float64 type verification.

  • Example test float value to post:

  500.568
  

Commands

This device service supports commanding functionality with a sample profile for the data types as shown in below table.

Using curl command-line utility or PostMan we can send GET/PUT request to EdgeX. These commands are explained in GET Command section below. End device can be anything, For example nodejs based REST emulator is used as end device for testing commanding functionaity of the REST device service. Example end device code is mentioned in End Device section below.

Simulated End Device

Example simulated end device code using nodejs is as shown below. This example code is has endpoint for int8 resource. To test GET/SET commands for other resources, this code needs to be expanded in the same way for other device resources also.

///////////////////BUILD AND RUN INSTRUCTIONS/////////////////////
// Install node, npm, express module in target machine
// Run using "node end-device.js"
/////////////////////////////////////////////////////////////////

var express = require('express');
var bodyParser = require('body-parser')
var app = express();

var textParser = bodyParser.text({type: '*/*'})

//-128 to 127
var int8 = 111

// GET int8
app.get('/api/int8', function (req, res) {
console.log("Get int8 request");
res.end(int8.toString());
})

// PUT int8
app.put('/api/int8', textParser, function (req, res) {
console.log("Put int8 request");
console.log(req.body);
int8 = req.body;
res.end(int8);
})

var server = app.listen(5000, function () {
var host = server.address().address
var port = server.address().port
console.log("Server listening at http://%s:%s", host, port)
})

GET Command

Example Core Command GET request for int8 device resource using curl command-line utility is as shown below.

   $ curl --request GET http://localhost:59882/api/v2/device/name/2way-rest-device/int8

http://localhost:59882/api/v2/device/name/2way-rest-device/int8

2way-rest-device is the device name as defined in the device file.

   {
   "apiVersion" : "v3",
   "event" : {
      "apiVersion" : "v3",
      "deviceName" : "2way-rest-device",
      "id" : "46baf3d5-98fd-4073-b52e-801660b01ce6",
      "origin" : 1670506568209119757,
      "profileName" : "sample-2way-rest-device",
      "readings" : [
         {
            "deviceName" : "2way-rest-device",
            "id" : "c7d4d4fe-13f5-423a-8d62-0e57f8dbc063",
            "origin" : 1670506568209111164,
            "profileName" : "sample-2way-rest-device",
            "resourceName" : "int8",
            "value" : "111",
            "valueType" : "Int8"
         }
      ],
      "sourceName" : "int8"
   },
   "statusCode" : 200
   } 

SET Command

$ curl -i -X PUT -H "Content-Type: application/json" -d '{"int8":12}' http://localhost:59882/api/v2/device/name/2way-rest-device/int8

http://localhost:59882/api/v2/device/name/2way-rest-device/int8

2way-rest-device is the device name as defined in the device list.

HTTP/1.1 200 OK
Content-Type: application/json
X-Correlation-Id: d208c432-0ee4-4d7e-b819-378bec45cbf6
Date: Thu, 08 Dec 2022 14:02:14 GMT
Content-Length: 37

{"apiVersion":"v2","statusCode":200}