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Owlet Unnoficial API Protocol

This document describes the Owlet Unnoficial API protocol used for communicating with the Harmony Link device.

Owlet Device

The Owlet connects to your home wireless network and reports information to the Ayla Networks IOT cloud

Authentication

Obtaining Authentication Token

The first step in authenticating is sending an Owlet username and password to an Ayla Networks web service. The endpoint for getting an authentication token is:

https://user-field.aylanetworks.com/users/sign_in.json

A POST request is sent to this URL with a payload of JSON. The Content-Type and 'Accept' request header must be set to application/json and the body of the request should contain JSON like this:

{
  "user": {
    "email": "email",
    "password": "password",
    "application": {
      "app_id": "OWL-id",
      "app_secret": "OWL-4163742"
    }
  }
}

The response will also be JSON of the form:

{
    "access_token": "access token",
    "refresh_token": "refresh token",
    "expires_in": 86400,
    "role": "EndUser",
    "role_tags": []
}

The access token is then used in every step after this as the 'Authorization' header. It is only valid for 24 hours.

DSN Number

Now we need to get the list of devices tied to the account in order to get the DSN (Assuming it means Device Serial Number). Another post request is made, this time to:

https://ads-field.aylanetworks.com/apiv1/devices.json

A POST request is sent to this URL with a payload of JSON. The Content-Type and 'Accept' request header must be set to application/json, as well as the 'Authorization' header set to '(access token)'. This will return JSON as well, and should look like this:

[
    {
        "device": {
            "product_name": "Owlet Baby Monitors",
            "model": "model",
            "dsn": "ab123456789012345",
            "oem_model": "BabyOwl",
            "sw_version": "version",
            "template_id": 0000,
            "mac": "mac",
            "unique_hardware_id": null,
            "hwsig": "sigmac",
            "lan_ip": "IP",
            "connected_at": "date/time",
            "key": 12345678,
            "lan_enabled": false,
            "has_properties": true,
            "product_class": null,
            "connection_status": "Offline",
            "lat": "lat",
            "lng": "lng",
            "locality": "zip",
            "device_type": "Wifi"
        }
    }
]

The DSN is used when polling the data URL to get measurements.

Getting Measurements

Once you have both the access token and the dsn for the device you are trying to get data from, you can actually request that data. The request is sent in the form of a GET to: https://ads-field.aylanetworks.com/apiv1/dsns/(dsn)/properties.json

Notice the (dsn) in the url, this needs to be replaced with the dsn that you are trying to request information from. The request must also contain a payload of JSON: The Content-Type and 'Accept' request header must be set to application/json,
as well as the 'Authorization' header set to '(access token)'.

The results will be in JSON, and should look like this (with an entry for each Property Name, listed below):

[
    {
        "property": {
            "type": "Property",
            "name": "AGE_MONTHS_OLD",
            "base_type": "integer",
            "read_only": false,
            "direction": "input",
            "scope": "user",
            "data_updated_at": "null",
            "key": 12345678,
            "device_key": 12345678,
            "product_name": "Owlet Baby Monitors",
            "track_only_changes": true,
            "display_name": "Age (Months)",
            "host_sw_version": false,
            "time_series": false,
            "derived": false,
            "app_type": null,
            "recipe": null,
            "value": null,
            "denied_roles": [],
            "ack_enabled": false,
            "retention_days": 30
        }
    },

The Properties listed in the results are:

AGE_MONTHS_OLD
ALRTS_DISABLED
ALRT_SNS_BLE
ALRT_SNS_YLW
APP_ACTIVE
AVERAGE_DATA
BABY_NAME
BASE_STATION_ON
BATT_LEVEL
BIRTHDATE
BLE_MAC_ID
BLE_RSSI
CHARGE_STATUS
CRIT_BATT_ALRT
CRIT_OX_ALRT
DEVICE_PING
DISABLE_LOGGED_DATA
ELEVATION
GENDER
HEART_RATE
HIGH_HR_ALRT
LATITUDE
LIVE_DATA_STREAM
LOCAL_BLE_MAC_ID
LOGGED_DATA_CACHE
LONGITUDE
LOW_BATT_ALRT
LOW_BATT_PRCNT
LOW_HR_ALRT
LOW_INTEG_READ
LOW_OX_ALRT
LOW_PA_ALRT
MOVEMENT
NURSERY_MODE
oem_base_version
oem_sock_version
ON_BOARDING
OTA_ERROR
OTA_STATUS
OXYGEN_LEVEL
PREMATURE
SHARE_DATA
SOCK_CONNECTION
SOCK_DISCON_ALRT
SOCK_DIS_APP_PREF
SOCK_DIS_NEST_PREF
SOCK_OFF
SOCK_REC_PLACED

The main properties I was concerned with were:

OXYGEN_LEVEL
HEART_RATE
BASE_STATION_ON
BATT_LEVEL
MOVEMENT
SOCK_OFF
CHARGE_STATUS
BABY_NAME
SOCK_CONNECTION

The value field is what will show the measurement that we are looking for. This documentation is still a work in progress, and I owe everything found here to the following projects:

https://github.com/bobcat0070/python-owlet https://github.com/tescalada/python-owlet (forked from above with some minor changes) https://github.com/arosequist/node-owlet