# Handling calibration data¶

## How to store data¶

The easiest way is to edit your kit in the /edit page: https://smartcitizen.me/kits/XXXXX/edit

In this field, input the code you will find on the device, on a yellow sticker, as seen below:

The calibration data for is managed by an unique hardware ID, and should be visible in the device itself (on a sticker, normally on the form of SCXSXX000X). This ID serves to identify the hardware calibration data, alongside with the processing description we want for that device. All this information can be saved in the platform's device using the postprocessing field of the device.

Warning

Only follow these steps if you are working on the data post-processing of the sensors, or you know what all this means!

The hardware url field in the kit edit page can contain a simple id as shown above or an URL pointing to a valid json:

This url should point to a valid json, and as long as it follows the instructions defined here, it will be picked up for data postprocessing. A simpler way, is that it can simply be one of the HARDWARE-ID from the list of jsons available in https://raw.githubusercontent.com/fablabbcn/smartcitizen-data/master/hardware/<HARDWARE-ID>.json. The default hardware definitions are in the scdata github repository and can be found per ID.json. You can just take the corresponding ID and click in the raw button to get the url needed. If you are using this method, and an url from github, this field should look something like: https://raw.githubusercontent.com/fablabbcn/smartcitizen-data/master/hardware/SCAS21001.json.

With either method, url or HARDWARE-ID, the json file needs to follow the instructions below to successfully be a valid postprocessing:

{
"blueprint_url": "https://raw.githubusercontent.com/fablabbcn/smartcitizen-data/master/blueprints/sck_21.json",
"description": "Smart Citizen Kit 2.1 With PMS5003",
"versions": [],
"forwarding": "nilu"
}

• blueprint_url: this field defines the post-processing to be done in the form of a device-blueprint. It virtually can load a valid json from any url, as long as it follows the instructions defined here and here. If you want to use the base processing select it from the blueprints folder, only selecting the raw json as mentioned above. If you have doubts, please, contact us to make sure everything will run smoothly. Finally, other blueprints can be added as defined in this guide
• description: brief description of the hardware
• versions: list containing hardware versions (in case sensors where replaced, but kept in the same physical unit).
  "versions": [
{
"ids": {
"AS_48_01": "162581715",
"AS_48_23": "202365014",
"AS_4A_01": "164200218",
"AS_4A_23": "204440527"
},
"from": "2020-11-30",
"to": null
}
]

• forwarding: if this device needs to be forwarded to another data platform. Current supported platforms are specified in the connectors folder

### Alternative method¶

Alternatively, in order to post this data, you can follow to other methods:

• either send us the kit ID and it's corresponding hardware ID, and we will do this for you
• or, if you are familiar with http requests you can post this data as such:
curl 'https://api.smartcitizen.me/v0/devices/<DEVICE-ID>' -X PATCH -H 'Authorization: Bearer <BEARER-FROM-YOUR-USER-PROFILE>' -H 'Content-Type: application/json;charset=UTF-8' --data-binary '{"postprocessing_attributes": {"blueprint_url": "https://raw.githubusercontent.com/fablabbcn/smartcitizen-data/master/blueprints/<BLUEPRINT_ID>.json", "hardware_url": "https://raw.githubusercontent.com/fablabbcn/smartcitizen-data/master/hardware/<HARDWARE_ID>.json"}}' --compressed


You can get your authorization token on your user profile page in the OAuth section. Make sure to change the following fields in the command above:

• <DEVICE-ID>
• <BEARER-FROM-YOUR-USER-PROFILE>
• <HARDWARE_ID>, for instance SCAS210002
• <BLUEPRINT_ID>, for instance sc_21_station_module for Smart Citizen Stations

Check it out

Once this process is done, you should be able to check that the postprocessing is safely stored in the Platform by visiting: https://api.smartcitizen.me/v0/devices/<DEVICE-ID>/. After this, we will take care of processing the data in a periodic way.