in transform_binary_payload/src-payload-decoders/python/dragino_laq4.py [0:0]
def dict_from_payload(base64_input: str, fport: int = None):
""" Decodes a base64-encoded binary payload into JSON.
Parameters
----------
base64_input : str
Base64-encoded binary payload
fport: int
FPort as provided in the metadata. Please note the fport is optional and can have value "None", if not provided by the LNS or invoking function.
If fport is None and binary decoder can not proceed because of that, it should should raise an exception.
Returns
-------
JSON object with key/value pairs of decoded attributes
"""
decoded = base64.b64decode(base64_input)
# Battery voltage
battery_value = ((decoded[0] << 8 | decoded[1]) & 0x3FFF) / 1000
mode=(decoded[2] & 0b01111100)>>2
if mode == 1: #mode = 1 #for Normal Operation
Work_mode="CO2"
if (decoded[2] & 0b00000001):
Alarm_status = "TRUE"
else:
Alarm_status = "FALSE"
TVOC_ppb= decoded[3]<<8 | decoded[4]
CO2_ppm= decoded[5]<<8 | decoded[6]
# sensor temperature
if (decoded[7] & 0b1000000):
temperature = ((decoded[7] << 8 | decoded[8]) - 0xFFFF)/10
else:
temperature = (decoded[7] << 8 | decoded[8])/10
# Humidity
humidity = ((decoded[9] << 8 | decoded[10])/10)
result = {
"battery_value": battery_value,
"work_mode": Work_mode,
"alarm_status": Alarm_status,
"TVOC_ppb": TVOC_ppb,
"CO2_ppm": CO2_ppm,
"temperature": temperature,
"humidity": humidity,
}
elif mode == 31: #mode = 31 #for Test
work_mode="ALARM"
temperature_min= decoded[3]<<24>>24
temperature_max= decoded[4]<<24>>24
humidity_min= decoded[5]
humidity_max= decoded[6]
CO2_min= decoded[7]<<8 | decoded[8]
CO2_max= decoded[9]<<8 | decoded[10]
result = {
"battery_value": battery_value,
"work_mode": work_mode,
"temperature_min": temperature_min,
"temperature_max": temperature_max,
"humidity_min": humidity_min,
"humidity_max": humidity_max,
"CO2_min": CO2_min,
"CO2_max": CO2_max,
}
else:
raise Exception("Invalid Sensor Mode")
return result