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sensemoreMqttClient.py
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import paho.mqtt.client as mqtt
import ssl
import json
import time
class ACCELEROMETER_RANGE:
RANGE_2G = 1
RANGE_4G = 2
RANGE_8G = 3
RANGE_16G = 4
class SAMPLING_RATE:
HZ_800 = 5
HZ_1600 = 6
HZ_3200 = 7
HZ_6400 = 8
HZ_12800 = 9
class Measurement:
def __init__(self, sampleSize=1000, accelerometerRangeIndex=1, samplingRateIndex=5, id="0"*24):
self.accelerometer_X = []
self.accelerometer_Y = []
self.accelerometer_Z = []
self.metadata = None
self.chunks = {}
self.accelerometerRangeIndex = accelerometerRangeIndex
self.accelerometerRange = self.rangeIndexToRange(
accelerometerRangeIndex)
self.samplingRateIndex = samplingRateIndex
self.sampleSize = sampleSize
self.id = id
self.time = None
self.rangeCoefficient = self.rangeIndexToCoefficient(
accelerometerRangeIndex)
def setMetadata(self, metadata):
self.metadata = metadata
def setTelemetries(self, telemetries):
self.telemetries = telemetries
def on_measurement_done():
pass
def rangeIndexToRange(self, rangeIndex):
return 2**rangeIndex
def rangeIndexToCoefficient(self, rangeIndex):
range = 2**rangeIndex
return (range*2)/(2 ** 16)
def addChunk(self, chunkNo, chunk):
values = []
for i in range(0, len(chunk), 2):
int16_bytes = bytes(chunk[i:i+2]) # each 2 byte holds int16
value = int.from_bytes(
int16_bytes, byteorder='little', signed=True)
value = value * self.rangeCoefficient
values.append(value)
self.chunks[chunkNo] = values
def calculate_chunks(self):
keys = self.chunks.keys()
keys_sorted = sorted(keys, reverse=True)
ordered = []
for key in keys_sorted:
ordered.extend(self.chunks[key])
for i in range(0, len(ordered), 3):
self.accelerometer_X.append(ordered[i])
self.accelerometer_Y.append(ordered[i+1])
self.accelerometer_Z.append(ordered[i+2])
class SensemoreMQTTClient:
def __init__(self, gateway):
self.gateway = gateway
self.scanReslts = {}
self.measurements = {}
def on_measurement_done(self, measurement):
pass
def loop_forever(self):
self.client.loop_forever()
def connect(self, host, port, ca_cert, certfile, keyfile):
self.client = mqtt.Client()
self.client.on_connect = self.on_connect
self.client.on_message = self.on_message
self.client.tls_set(ca_certs=ca_cert, certfile=certfile, keyfile=keyfile,
cert_reqs=ssl.CERT_NONE, tls_version=ssl.PROTOCOL_TLSv1_2)
self.client.tls_insecure_set(True)
self.client.connect(host, port, 60)
# The callback for when the client receives a CONNACK response from the server.
def ota_device(self, url, device):
topic = "prod/gateway/{0}/device/{1}/ota".format(self.gateway, device)
self.client.publish(topic, url)
def on_ota_device_accepted(self, device):
pass
def on_ota_device_rejected(self, device, message):
pass
def on_ota_device_done(self, device, message):
pass
def on_measurement_accepted(self, measurementId, device):
pass
def on_measurement_rejected(self, measurementId, device, msg):
pass
def measure(self, sampleSize, accelerometerRange, samplingRate, device):
measurement = Measurement(sampleSize, accelerometerRange, samplingRate)
self.measurements[measurement.id] = measurement
topic = "prod/gateway/{0}/device/{1}/measure/{2}".format(
self.gateway, device, measurement.id)
payload = "{0},{1},{2}".format(
accelerometerRange, samplingRate, sampleSize)
self.client.publish(topic, payload)
def on_connect(self, client, userdata, flags, rc):
print("Connected, RC:", rc)
self.client.subscribe("prod/gateway/"+self.gateway+"/#")
self.client.subscribe('prod/device/#')
def on_message(self, client, userdata, msg):
print(msg.topic)
splitted = msg.topic.split('/')
# "prod/gateway/<gwmac>/scanDevice"
if(len(splitted) == 4
and splitted[0] == 'prod'
and splitted[1] == 'gateway'
and splitted[2] == self.gateway
and splitted[3] == 'scanDevice'):
message = str(msg.payload, 'utf-8')
self.scanReslts = json.loads(message)
print(self.scanReslts)
# "prod/gateway/<gwmac>/device/<device-mac>/measure/<measurementId>/chunk/<chunkIndex>"
elif (len(splitted) == 7
and splitted[0] == 'prod' and splitted[1] == 'device' and splitted[3] == 'measure' and splitted[4] in self.measurements.keys() and splitted[5] == 'chunk'):
measurement = self.measurements[splitted[4]]
measurement.addChunk(splitted[6], msg.payload)
# "prod/gateway/<gwmac>/device/<device-mac>/measure/<measurementId>/done"
elif (len(splitted) == 8 and splitted[0] == 'prod' and splitted[1] == 'gateway' and splitted[2] == self.gateway and splitted[3] == 'device' and splitted[5] == 'measure' and splitted[6] in self.measurements.keys() and splitted[7] == 'done'):
measurement = self.measurements[splitted[6]]
measurement.calculate_chunks()
doneJson = json.loads(str(msg.payload, 'utf-8'))
measurement.setMetadata(doneJson)
self.on_measurement_done(measurement)
# "prod/gateway/<gwmac>/device/<device-mac>/measure/<measurementId>/accepted"
elif (len(splitted) == 8 and splitted[0] == 'prod' and splitted[1] == 'gateway' and splitted[2] == self.gateway and splitted[3] == 'device' and splitted[5] == 'measure' and splitted[6] in self.measurements.keys() and splitted[7] == 'accepted'):
# measurementId,devicemac
self.on_measurement_accepted(splitted[6], splitted[3])
# "prod/gateway/<gwmac>/device/<device-mac>/measure/<measurementId>/rejected"
elif (len(splitted) == 8 and splitted[0] == 'prod' and splitted[1] == 'gateway' and splitted[2] == self.gateway and splitted[3] == 'device' and splitted[5] == 'measure' and splitted[6] in self.measurements.keys() and splitted[7] == 'rejected'):
self.on_measurement_rejected(
splitted[6], splitted[4], str(msg.payload, 'utf-8'))
# "prod/gateway/<gwmac>/device/<device-mac>/ota/accepted"
elif (len(splitted) == 7 and splitted[0] == 'prod' and splitted[1] == 'gateway' and splitted[2] == self.gateway and splitted[3] == 'device' and splitted[5] == 'ota' and splitted[6] == 'accepted'):
self.on_ota_device_accepted(splitted[4])
# "prod/gateway/<gwmac>/device/<device-mac>/ota/rejected"
elif (len(splitted) == 7 and splitted[0] == 'prod' and splitted[1] == 'gateway' and splitted[2] == self.gateway and splitted[3] == 'device' and splitted[5] == 'ota' and splitted[6] == 'rejected'):
self.on_ota_device_rejected(splitted[4], str(msg.payload, 'utf-8'))
# "prod/gateway/<gwmac>/device/<device-mac>/ota/done"
elif (len(splitted) == 7 and splitted[0] == 'prod' and splitted[1] == 'gateway' and splitted[2] == self.gateway and splitted[3] == 'device' and splitted[5] == 'ota' and splitted[6] == 'done'):
self.on_ota_device_done(splitted[4], str(msg.payload, 'utf-8'))