I have a device publishing through a gateway on the events topic (/devices/<dev_id>/events/motion) to PubSub. It's landing in PubSub correctly but subFolder is just an empty string.
On the gateway I'm publishing using the code below. f"mb.{device_id}" is the device_id (not the gateway ID and attribute could be anything - motion, temperature, etc
def report(self, device_id, attribute, value):
topic = f"/devices/mb.{device_id}/events/{attribute}"
timestamp = datetime.utcnow().timestamp()
client.publish(topic, json.dumps({"v": value, "ts": timestamp}))
And this is the cloud function listening on the PubSub queue.
def iot_to_bigtable(event, context):
payload = json.loads(base64.b64decode(event["data"]).decode("utf-8"))
timestamp = payload.get("ts")
value = payload.get("v")
if not timestamp or value is None:
raise BadDataException()
attributes = event.get("attributes", {})
device_id = attributes.get("deviceId")
registry_id = attributes.get("deviceRegistryId")
attribute = attributes.get("subFolder")
if not device_id or not registry_id or not attribute:
raise BadDataException()
A sample of the event in Pub/Sub:
{
@type: 'type.googleapis.com/google.pubsub.v1.PubsubMessage',
attributes: {
deviceId: 'mb.26727bab-0f37-4453-82a4-75d93cb3f374',
deviceNumId: '2859313639674234',
deviceRegistryId: 'mb-staging',
deviceRegistryLocation: 'europe-west1',
gatewayId: 'mb.42e29cd5-08ad-40cf-9c1e-a1974144d39a',
projectId: 'mb-staging',
subFolder: ''
},
data: 'eyJ2IjogImxvdyIsICJ0cyI6IDE1OTA3NjgzNjcuMTMyNDQ4fQ=='
}
Why is subFolder empty? Based on the docs I was expecting it to be the attribute (i.e. motion or temperature)
