Sending Array from Photon to Pi

[CalmRaptor]

Hi,

I have been trying to send an array of numbers from the Particle Photon device to the Raspberry Pi. I was trying out the particle function, but it only seems to return an integer.

What are other alternatives?
I was thinking of using particle.variable where I can append all the integers in the array together separated by commas to create one giant string and then putting that into particle.variable. The raspberry pi could then call once a minute or so to get the particle.variable and decode the string array.

Thanks

[ScruffR]

Particle.publish() would be the way to push data to the RPi.
The RPi can subscribe to this SSE (e.g. via particle subscribe)

[CalmRaptor]

Where can I find an example of subscribing a pi to the particle cloud? I seem to only find examples of installing the particle agent onto the pi and controlling a led. But nothing much about subscribing a pi to the cloud.

[ScruffR]

When you install CLI on the RPi you can use the command I mentioned above.

You could also use the JavaScript SDK to subscribe to an event stream.
SSE is nothing specific to Particle but a common technique you can virtually use with any programming or script language.

[CalmRaptor]

So I see my pi printing out all the events. I guess that every time I want my Pi to subscribe to the cloud, I would need my python code to type into the terminal the particle subscribe command and then have a function in my code to subscribe to the event stream.

[dreamER]

Hi,
try this one

from sseclient import SSEClient
import json


devID = "xxx_your_dev_id_here"
AToken = "xxx_your_token_here"

particleURL = 'https://api.particle.io/v1/devices/' + devID + '/events/?access_token=' + AToken

messages = SSEClient(particleURL)

for msg in messages:
    outputMsg = msg.data
    if type(outputMsg) is not str:
        outputJS = json.loads(outputMsg)
        FilterName = "data"
        print(outputJS[FilterName])

this example is in Python 3 and original idea comes from here

[CalmRaptor]

Thanks