Adding reflection

Firmware
1

Hi,
fetching variable values (or executing function) through a REST API is a great feature but for this to be more useful when you have multiple cores logging different type of data it would be great to add a reflection api.

So I set ut to add the code into the core. However when I started to implement it I found that there is already some code present in spark_protocol.cpp that does this. There is a CoAPMessageType::DESCRIBE message type that returns the function names, variables and types.

To try it out I added some code that returned this info when requesting a string with name ‘~’ and got (with a slightly changed main program)

“result”: “{“f”:[“digitalread”,“digitalwrite”,“analogread”,“analogwrite”],“v”:{“temperature”:9,“humidity”:9,”~":4}}"

So my question is how to access this cool information through the rest API?

2

Hi @madlers

If understand your question correctly, you want to read this doc

http://docs.spark.io/api/#introduction

And then use

curl https://api.spark.io/v1/devices/48...12/?access_token=01234...56789

Where 48…12 is replaced by your device id and 01234…56789 is replaced by your access token.

This will return something like this:

{
  "id": "48...12",
  "name": "your_core_name",
  "connected": true,
  "variables": {},
  "functions": []
}

If you leave off the device id from the request, you get all your devices.

1 Like
3

Yes, thats exactly what I was looking for. I missed it completely when reading the documentation (I was looking further down at the variable and function section).

Thanks!

1 Like