# Handling calibration data¶

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.

## How to store data¶

The easiest way is to go to the kit-edit view of your kit: https://smartcitizen.me/kits/XXXXX/edit

In there, you can update the field hardware_id. This field defines an url for hardware calibration IDs to be loaded from, as well as some additional information. It virtually can load a valid json from any url, as long as it follows the instructions defined here. 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. This field should look something like: https://raw.githubusercontent.com/fablabbcn/smartcitizen-data/master/hardware/SCAS21001.json. This json file needs to follow the instructions below to successfully represent 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.