def PublishMQTT(mailType, timeString="", timeStringCritical=""):
ConnectWLAN(True)
# Config MQTT
mqttClient = AWSIoTMQTTClient(clientID)
mqttClient.configureEndpoint(awsHost, awsPort)
mqttClient.configureCredentials(awsRootCA, awsPrivateKey, awsClientCert)
mqttClient.configureOfflinePublishQueueing(offlineQueueSize)
mqttClient.configureConnectDisconnectTimeout(connectDisconnectTimeout)
# Connect
if mqttClient.connect():
print("MQTT connected")
# Publish topic, AWS Lambda Python code uses the json to create mail title and body.
mqttClient.publish(
topic,
json.dumps({
"mailType": str(mailType),
"timeString": timeString,
"timeStringCritical": timeStringCritical
}), 0)
# Disconnect
if mqttClient.disconnect():
print("MQTT disconnected")
ConnectWLAN(False)
# Save variables to be loaded when waking up from deep sleep.
Save()
machine.deepsleep(deepSleepTime)
class AWS(object):
"""
AWS IoT communication with Pycom provided libraries
"""
def __init__(self):
"""
Initialization of AWS Class
"""
self.client = None
self.is_connected = False
def connect(self):
"""
Connect AWS IoT
"""
if self.client is None:
# Configure the MQTT client
self.client = AWSIoTMQTTClient(config.AWS_IOT_CLIENT_ID)
self.client.configureEndpoint(config.AWS_IOT_HOST, config.AWS_IOT_PORT)
self.client.configureCredentials(config.AWS_IOT_ROOT_CA,
config.AWS_IOT_PRIVATE_KEY,
config.AWS_IOT_CLIENT_CERT)
self.client.configureOfflinePublishQueueing(config.AWS_IOT_OFFLINE_QUEUE_SIZE)
self.client.configureDrainingFrequency(config.AWS_IOT_DRAINING_FREQ)
self.client.configureConnectDisconnectTimeout(config.AWS_IOT_CONN_DISCONN_TIMEOUT)
self.client.configureMQTTOperationTimeout(config.AWS_IOT_MQTT_OPER_TIMEOUT)
# Connect to MQTT Host
if self.client.connect():
self.is_connected = True
log.info('AWS IoT connection succeeded')
else:
raise socket.error('AWS IoT connection failed')
def publish(self, msg=None):
"""
Publish message
"""
log.info('Publish [{}]', json.dumps(msg))
self.client.publish(config.AWS_IOT_TOPIC, json.dumps(msg), 1)
def disconnect(self):
"""
Disconnect AWS IoT
"""
if self.client:
if self.client.disconnect():
log.info('AWS IoT disconnected')
self.is_connected = False
self.client = None