Azure IoT Central device client for Python
Project description
iotc - Azure IoT Central - Python (light) device SDK Documentation
Prerequisites
Python 2.7+ or Python 3.4+ or Micropython 1.9+
Runtime dependencies vary per platform
Install
Python 2/3
pip install iotc
Usage
import iotc
device = iotc.Device(scopeId, keyORCert, deviceId, credType)
- scopeId : Azure IoT DPS Scope Id
- keyORcert : Symmetric key or x509 Certificate
- deviceId : Device Id
- credType :
IOTConnectType.IOTC_CONNECT_SYMM_KEY
orIOTConnectType.IOTC_CONNECT_X509_CERT
keyORcert
for X509
certificate:
credType = IOTConnectType.IOTC_CONNECT_X509_CERT
keyORcert = {
"keyfile": "/src/python/test/device.key.pem",
"certfile": "/src/python/test/device.cert.pem"
}
keyORcert
for SAS
token:
credType = IOTConnectType.IOTC_CONNECT_SYMM_KEY
keyORcert = "xxxxxxxxxxxxxxx........"
setLogLevel
set logging level
device.setLogLevel(logLevel)
logLevel : (default value is IOTC_LOGGING_DISABLED
)
class IOTLogLevel:
IOTC_LOGGING_DISABLED = 1
IOTC_LOGGING_API_ONLY = 2
IOTC_LOGGING_ALL = 16
i.e. => device.setLogLevel(IOTLogLevel.IOTC_LOGGING_API_ONLY)
setServiceHost
set the service endpoint URL
device.setServiceHost(url)
url : URL for service endpoint. (default value is global.azure-devices-provisioning.net
)
call this before connect
connect
connect device client
device.connect()
i.e. device.connect()
sendTelemetry
send telemetry
device.sendTelemetry(payload)
payload : A text payload.
i.e. device.sendTelemetry('{ "temperature": 15 }')
sendState
send device state
device.sendState(payload)
payload : A text payload.
i.e. device.sendState('{ "status": "WARNING"}')
sendProperty
send reported property
device.sendProperty(payload)
payload : A text payload.
i.e. device.sendProperty('{"countdown":{"value": %d}}')
doNext
let framework do the partial MQTT work.
device.doNext()
isConnected
returns whether the connection was established or not.
device.isConnected()
i.e. device.isConnected()
disconnect
disconnect device client
device.disconnect()
i.e. device.disconnect()
on
set event callback to listen events
ConnectionStatus
: connection status has changedMessageSent
: message was sentCommand
: a command received from Azure IoT CentralSettingsUpdated
: device settings were updated
i.e.
def onconnect(info):
if info.getStatusCode() == 0:
print("connected!")
device.on("ConnectionStatus", onconnect)
def onmessagesent(info):
print("message sent -> " + info.getPayload())
device.on("MessageSent", onmessagesent)
def oncommand(info):
print("command -> " + info.getPayload())
device.on("Command", oncommand)
def onsettingsupdated(info):
print("settings -> " + info.getTag() + " = " + info.getPayload())
device.on("SettingsUpdated", onsettingsupdated)
callback info class
iotc
callbacks have a single argument derived from IOTCallbackInfo
.
Using this interface, you can get the callback details and respond back when it's necessary.
public members of IOTCallbackInfo
are;
getResponseCode()
: get response code or None
getResponseMessage()
: get response message or None
setResponse(responseCode, responseMessage)
: set callback response
i.e. info.setResponse(200, 'completed')
getClient()
: get active device
client
getEventName()
: get the name of the event
getPayload()
: get the payload or None
getTag()
: get the tag or None
getStatusCode()
: get callback status code
sample app
import iotc
from iotc import IOTConnectType, IOTLogLevel
deviceId = "DEVICE_ID"
scopeId = "SCOPE_ID"
mkey = "DEVICE_KEY"
# see iotc.Device documentation above for x509 argument sample
iotc = iotc.Device(scopeId, mkey, deviceId, IOTConnectType.IOTC_CONNECT_SYMM_KEY)
iotc.setLogLevel(IOTLogLevel.IOTC_LOGGING_API_ONLY)
gCanSend = False
gCounter = 0
def onconnect(info):
global gCanSend
print("- [onconnect] => status:" + str(info.getStatusCode()))
if info.getStatusCode() == 0:
if iotc.isConnected():
gCanSend = True
def onmessagesent(info):
print("\t- [onmessagesent] => " + str(info.getPayload()))
def oncommand(info):
print("- [oncommand] => command name(" + info.getTag() + ") => " + str(info.getPayload()))
def onsettingsupdated(info):
print("- [onsettingsupdated] => settings name(" + info.getTag() + ") => " + info.getPayload())
iotc.on("ConnectionStatus", onconnect)
iotc.on("MessageSent", onmessagesent)
iotc.on("Command", oncommand)
iotc.on("SettingsUpdated", onsettingsupdated)
iotc.connect()
while iotc.isConnected():
iotc.doNext() # do the async work needed to be done for MQTT
if gCanSend == True:
if gCounter % 20 == 0:
gCounter = 0
print("Sending telemetry..")
iotc.sendTelemetry("{\"temp\": " + str(randint(20, 45)) + "}")
gCounter += 1
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