[SOLVED] Webhooks / Backand - Request doesn't get send

Troubleshooting
1

Hi,

I am having trouble using Webhooks with Backand. I created the following webhook:

{
    "event": "get_bell_object",
    "url": "{{BACKAND_API_URL}}/objects/bells",
    "requestType": "GET",
    "headers": {
        "AnonymousToken": "{{BACKAND_ANONYMOUS_TOKEN}}"
    },
    "query": {
        "filter": "[{\"fieldName\":\"{{device_type}}\",\"operator\":\"equals\",\"value\":\"{{device_id}}\"}]"
    },
    "mydevices": true,
    "noDefaults": true,
    "rejectUnauthorized": false
}

I subscribe and publish the event as follows:

Particle.subscribe("hook-response/get_bell_object", getBellObject, MY_DEVICES);

Particle.publish("get_bell_object", "{\"BACKAND_API_URL\":\"https://api.backand.com/1\", \"BACKAND_ANONYMOUS_TOKEN\":\"1234567890987654321\", \"device_type\":\"particle_bell_id\", \"device_id\":\"1234567890987654321\"}", 60, PRIVATE);

The problem is that the event handler never gets called. Using particle subscribe mine I do not see anything else than the event publishing. So I am not even sure the request is even sent. For sure there is no reply from Backend.

I tried to send the request to a requestb.in and it works. The query is well formatted and the event handler is called. I tried to call the Backand API with Postman and it also works.

Any clues?

Thanks,

Guillaume

2

Have you tried hardcoding the URL in your webhook first before submitting it on the fly?

3

Yes I did. I used Requestb.in to check that the variables are correctly inserted in the Webhook template. All is fine.

4

I still haven’t figured my problem out but now I know how to confirm that a webhook succeeded from the Particle Event Stream: Confirming that a webhook succeeded

5

Hi,

I found the problem. I come from the url field. Apparently the webhook template fails to replace the BACKAND_API_URL variable. All the other variables work fine. If I hardcode the url field, the webhook succeeds and I get the expected data from Backand.

@ScruffR You were right. I must have screwed my initial test as per your suggestion.

Apparently the url field doesn’t work with variables.

Cheers,

1 Like