Unable to send Capability value from Lambda to Smartthings

Developer Programs Support
1

Hello everyone,

I’m trying to integrate a Thing from AWS IoT into Smartthings.
I’m almost there, my Thing is added to Smartthings but I am not able to update the Capability value.

My thing is a custom made Arduino project, and I monitor my swimming pool temperature, PH level and ORP value. Those values are sent to AWS.

Here is my setup:

  1. I have a Smartthings Schema Connector Project:

    image
    image999×107 5.38 KB

  2. The project is setup as an AWS Lambda, and all Device Cloud credentials are working fine.

  3. Also in this ST project, I have a Device Profile:

    image
    image545×620 13.2 KB

    and I added a standard Temperature Measurement capability:
    image

  4. My ST project is deployed to test and I can add the device in Smartthings.

  5. Here is my Lambda function code:

     const { lambda } = require("st-schema");

 async function discoveryRequest(request, response) {
     console.log('discoveryRequest', JSON.stringify(request,null,2));
     response.addDevice('PoolBoy-0001', 'PoolBoy', '951c7b9e-60a8-4ce5-97e0-35588731ccd8')
         .manufacturerName('Charles de la Sablonnière')
         .modelName("PoolBoy Home Made")
         .roomName('Backyard');
 }

 async function stateRefreshRequest(request, response) {
     console.log("stateRefreshRequest: ", JSON.stringify(request,null,2));
     response.addDevice('PoolBoy-0001', [
       {
         component: 'main',
         capability: 'st.temperature',
         attribute: 'temperature',
         value: 32.5
       }
     ]);
 }

 async function commandRequest(request, response) {
     console.log('commandRequest', JSON.stringify(request,null,2));
 }
 module.exports.handler = lambda({
     discoveryRequest,
     commandRequest,
     stateRefreshRequest
 });

  6. The stateRefreshRequest function is called, I can see this in AWS CloudWatch logs:

2020-08-06T07:21:26.845Z	b0b71cd0-7972-4b31-915d-3e07f8c17bc1	INFO	response back to SmartThings 
{
    "headers": {
        "schema": "st-schema",
        "version": "1.0",
        "interactionType": "stateRefreshResponse",
        "requestId": "60617cac-125c-527d-8c59-2b09a3ea0106"
    },
    "deviceState": [
        {
            "externalDeviceId": "PoolBoy-0001",
            "states": [
                {
                    "component": "main",
                    "capability": "st.temperature",
                    "attribute": "temperature",
                    "value": 32.5
                }
            ]
        }
    ]
}

The problem is, I never see the temperature value display “32.5” in the Smartthings app. It is always “0”
Anyone can help me with that? What am I doing wrong?

Thanks for your help,

Charles

2

Tagging @erickv @nayelyz

3

I don’t know how the schema works with regard to when and where you need to prepend the capability ID with ‘st.’, but I do know that the capability ID for Temperature Measurement is ‘temperatureMeasurement’ and not ‘temperature’. Could that be significant?

1 Like
4

Thanks @orangebucket for your input.

You were right on! :grinning:

Here is the response that made the value change in the Smartthings app :

2020-08-06T16:15:18.819Z	e121ca56-50ae-4381-bc60-26777c5ce019	INFO	response back to SmartThings 
{
    "headers": {
        "schema": "st-schema",
        "version": "1.0",
        "interactionType": "stateRefreshResponse",
        "requestId": "D517F053-7D08-4F0E-A36B-B3E85A9D83C1+ff5130df8968a138"
    },
    "deviceState": [
        {
            "externalDeviceId": "PoolBoy-0001",
            "states": [
                {
                    "component": "main",
                    "capability": "st.temperatureMeasurement",
                    "attribute": "temperature",
                    "value": 82,
                    "unit": "F"
                }
            ]
        }
    ]
}

It needs the “st.” I also added the unit, which is required according to the Capabilities reference (https://smartthings.developer.samsung.com/docs/api-ref/capabilities.html#Temperature-Measurement)

Another interesting thing is that if I set the values for multiple capabilities, and only one of them is not “formatted” properly, all values are ignored.

Thanks for your help,

Charles

5

I’m trying to do similar, but as soon as I reference the device profile ID in my discovery request rather than a standard capability, the smartthings app fails to recognise the device list when adding the device, instead returning a blank list. I’ve checked the logs for what is returned to Sametthings and it appears ok:

{
“headers”: {
“schema”: “st-schema”,
“version”: “1.0”,
“interactionType”: “discoveryResponse”,
“requestId”: “2AEEDD98-B933-4B32-B89C-6C1A05045F06”
},
“devices”: [
{
“externalDeviceId”: “30AEA4C55518”,
“friendlyName”: “iParcelBox-085024”,
“deviceHandlerType”: “0bb4da60-d1bb-4865-9ce7-9a22fe712e0b”,
“manufacturerInfo”: {
“manufacturerName”: “iParcelBox Ltd”,
“modelName”: “Smart Parcel Delivery Box”
}
},
{etc…

Is there any reason my app isn’t recognising the device profile?