I need answer of the question as sql query which can be written in python code(pyspark).

1. Detect failing devices with battery levels below a threshold.

Our file has rows of JSON strings that look as follows:

{"device_id": 198164, "device_name": "sensor-pad-198164owomcJZ", "ip": "80.55.20.25", "cca2": "PL", "cca3": "POL", "cn": "Poland", "latitude": 53.080000, "longitude": 18.620000, "scale": "Celsius", "temp": 21, "humidity": 65, "battery_level": 8, "c02_level": 1408,"lcd": "red", "timestamp" :1458081226051}