Package: blue-st-sdk
BlueST SDKBlueST SDK is a multi-platform library (Android,iOS, andLinuxsupported) that allows easy access to the data exported by a Bluetooth Low Energy (BLE) device that implements theBlueST Protocol.DocumentationDocumentation can be foundhere.CompatibilityThis version of the SDK is compatible withPython3.5 and runs on a Linux system.PreconditionsThe BlueST SDK makes use of thebluepyPython interface to Bluetooth Low Energy on Linux.$sudopip3installbluepyMoreover, it uses theconcurrent.futuresmodule to run pools of threads in background, that serve listeners' callbacks.$sudopip3installfuturesKnown LimitationsThe BlueST SDK currently suffers from the following limitations, which are intrinsic to thebluepylibrary:When running a discovery process, the already connected devices get disconnected.There is no supervision timeout API within the SDK, hence it is not possible to detect immediately an unexpected disconnection; it is detected and notified via listeners as soon as a read/write/notify operation is executed on the device.InstallationThe BlueST SDK can be installed through the Python pip package manager.$sudopip3installblue-st-sdkSetting up the application examplesBefore running the application examples, please prepare your devices as described here below. They need to be equipped with BLE connectivity and a FW compatible with theBlueST Protocol.Theexample_ble_1.pyapplication example shows how to perform a BLE scan, connect to a device, retrieve its exported features, and get push notifications from it. You can use, for example, theSensorTiledevelopment kit and theFP-SNS-MOTENV1function pack.Theexample_ble_2.pyapplication example shows how to perform a BLE scan, connect to a number of devices handled though dedicated threads, and get push notifications from all their features.Theexample_ble_3.pyapplication example shows how to connect to a BLE device exporting a "Stepper Motor" feature, to get its status, and to send commands to it. The application requires to set up a device equipped with BLE connectivity and a stepper motor control, e.g.:ANUCLEO-F401REdevelopment board.AnX-NUCLEO-IDB05A1Bluetooth Low Energy expansion board.AnX-NUCLEO-IHM01A1Stepper Motor Driver expansion board, plus a proper stepper motor.Import theNode_BLE_StepperMotor_Devicembed OS application to your ARM mbed account, compile, and flash it onto the MCU board.Edit the application example and set the "MOTOR_DEVICE_MAC" global variable with the proper MAC address of your stepper motor enabled BLE device (which you can retrieve for example through a smartphone application).Theexample_ble_4.pyapplication example shows how to handle two BLE devices exporting a "Switch" feature in such a way that pressing the user button on a device makes the LED of the other device toggle its state, through a logic defined within the application itself. The application requires to set up two devices equipped with BLE connectivity, e.g.:TwoNUCLEO-F401REdevelopment boardsTwoX-NUCLEO-IDB05A1Bluetooth Low Energy expansion boardsImport theNode_BLE_Switch_Devicembed OS application to your ARM mbed account, compile, and flash it onto the MCU boardEdit the application example and set the "IOT_DEVICE_X_MAC" global variables properly (you can use a smartphone application to retrieve the MAC address)Theexample_ble_5.pyapplication example shows how to connect to a microphone-enabled device exporting the "ADPCM Audio" and "ADPCM Sync" features, and allows to reproduce the recorded audio and to dump it on a file. You can use, for example, theSensorTiledevelopment kit and theFP-SNS-ALLMEMS1function pack.
Please refer to the application example file for the software requirements.Theexample_ble_6.pyapplication example shows how to connect to a device and perform a firmware upgrade. The application requires to set up a device equipped with a FW compatible with theBlueST Protocolthat embeds a bootloader. Note that only when flashing manually the board the first time a firmware that embeds a bootloader is required, while the firmware that can be upgraded via BLE to the device does not have to embed any bootloader. Please use, for example, the firmware available within theFP-AI-SENSING1function pack, which allows you to connect to IoT nodes and get Activity Recognition and Audio Scene Classification features. The function pack provides already binaries, both with and without the bootloader; just flash any of the firmware with the bootloader the first time, and try to upgrade it with another firmware without the bootloader previously stored on your gateway.Other application examples can be found within theEdgeST SDKfor Linux, an IoT edge computing abstraction library for Linux gateways.Running the application examplesTo run the application examples please follow the steps below:Install the BlueST SDK as described by theInstallationchapter.Clone the BlueST SDK git repository to download the application examples:$gitclonehttps://github.com/STMicroelectronics/BlueSTSDK_Python.gitEnter the "blue_st_examples" folder and run the desired script:$sudopython3example_ble_x.pyBlueST ProtocolAdvertising dataThe library shows only the devices that have a vendor-specific field formatted in the following way:Length111146NameLengthField TypeProtocol VersionDevice IdFeature MaskDevice MAC (optional)Value0x07/0x0D0xFF0x010xXX0xXXXXXXXX0xXXXXXXXXXXXXThe Field Length must be 7 or 13 bytes long.The Device Id is a number that identifies the type of device:0x00 for a generic device.0x01 is reserved for theSTEVAL-WESU1board.0x02 is reserved for theSTEVAL-STLKT01V1 (SensorTile)board.0x03 is reserved for theSTEVAL-BCNKT01V1 (BlueCoin)board.0x04 is reserved for theSTEVAL-IDB007VX (BlueNRG1)andSTEVAL-IDB008VX (BlueNRG2)boards.0x05 is reserved for theSTEVAL-BCN002V1 (BlueTile)board.0x06 is reserved for theSTEVAL-MKSBOX1V1 (SensorTile.box)board.0x07 is reserved for theB-L475E-IOT01A (STM32L4 Discovery kit IoT node)board.0x80 for a generic Nucleo board.In case you need to define your own custom boards, you should use Device Id values not yet assigned. Moreover, please note that values between 0x80 and 0xFF are reserved for ST Nucleo boards.The feature mask is a bit field that provides information about the features exported by the board. Currently, bits are mapped in the following way:Bit31302928272625242322212019181716FeatureAnalogADPCM SyncSwitchDirection of arrivalADPCM AudioMicrophone LevelProximityLuxmeterAccelerometerGyroscopeMagnetometerPressureHumidityTemperatureBatterySecond TemperatureBit1514131211109876543210FeatureCO SensorDC MotorStepper MotorSD LoggingBeam formingAccelerometer EventFree FallSensor Fusion CompactSensor FusionMotion IntensityCompassActivity RecognitionCarry PositionProximity GestureMEMS GesturePedometerTo understand the way the data are exported by predefined features, please refer to the methodFeature.extract_data(timestamp, data, offset)within the features class definition.The device MAC address is optional, and needed only on the iOS platform.NoteCurrently only a subset of the features is implemented: Switch, Proximity, Accelerometer, Gyroscope, Magnetometer, Pressure, Humidity, Temperature, Second Temperature, Stepper Motor, Proximity Gesture, Activity Recognition, ADPCM Audio, and ADPCM Sync. Moreover, other features not listed among the default 32-bit feature mask, are provided, like for example the Audio Scene Classification.
Future releases of the Python SDK will cover all the abovementioned features.Characteristics/FeaturesThe characteristics managed by the SDK must have a UUID as follows:XXXXXXXX-0001-11e1-ac36-0002a5d5c51b.
The SDK scans all the services, searching for characteristics that match the pattern.The first part of the UUID has bits set to "1" for each feature exported by the characteristics.In case of multiple features mapped onto a single characteristic, the data must be in the same order as the bit mask.A characteristic's data format must be the following:Length2>1>1NameTimestampFirst Feature DataSecond Feature Data.....The first 2 bytes are used to communicate a timestamp. This is especially useful to recognize any loss of data.Since the BLE packet maximum length is 20 bytes, the maximum size of a feature's data field is 18 bytes.ExampleThe SDK is compatible with the following ST firmware:FP-SNS-MOTENV1: STM32 ODE function pack for IoT node with BLE connectivity plus environmental and motion sensorsFP-SNS-ALLMEMS1: STM32 ODE function pack for IoT node with BLE connectivity, digital microphone, environmental and motion sensorsFP-SNS-FLIGHT1: STM32 ODE function pack for IoT node with BLE connectivity, environmental and motion sensors, time-of-flight sensors (Please remove NFC when used with Python SDK)Main actorsManagerThis is a singleton class that starts/stops the discovery process and stores the retrieved nodes.Before starting the scanning process, it is also possible to define a new Device Id and to register/add new features to already defined devices.The Manager notifies a new discovered node through theManagerListenerclass. Each callback is performed asynchronously by a thread running in background.NodeThis class represents a remote device.Through this class it is possible to recover the features exported by a node and read/write data from/to the device.The node exports all the features whose corresponding bit is set to "1" within the advertising data message. Once the device is connected, scanning and enabling the available characteristics can be performed. Then, it is possible to request/send data related to the discovered features.A node notifies its RSSI (signal strength) when created.A node can be in one of following status:Init: dummy initial status.Idle: the node is waiting for a connection and sending an advertising data message (i.e. disconnected).Connecting: a connection with the node was triggered, the node is performing the discovery of device services/characteristics.Connected: connection with the node was successful.Disconnecting: ongoing disconnection; once disconnected the node goes back to the Idle status.Lost: the device has sent an advertising data, however it is not reachable anymore.Unreachable: the connection with the node was in place, however it is not reachable anymore.Dead: dummy final status.Each callback is performed asynchronously by a thread running in background.FeatureThis class represents the data exported by a node.Each feature has an array ofFieldobjects that describes the data exported.Data are received from a BLE characteristic and contained in aSampleclass. The user is notified about new data through a listener.Note that each callback is performed asynchronously by a thread running in background.Available features can be retrieved from Features package.How to add a new FeatureExtend the Feature class:Create an array ofFieldobjects that describe the data exported by the feature.Create a constructor that accepts only the node as a parameter. From this constructor call the superclass constructor, passing the feature's name and the feature's fields.Implement the methodFeature.extract_data(timestamp, data, offset).Implement a class method that allows to get data from aSampleobject.Register the new feature:
If you want to use BlueST's bitmask for features within the advertising data, please register the new feature before performing the discovery process, e.g.:# Adding a 'MyFeature' feature to a Nucleo device and mapping it to a custom# '0x10000000-0001-11e1-ac36-0002a5d5c51b' characteristic.mask_to_features_dic={}mask_to_features_dic[0x10000000]=my_feature.MyFeaturetry:Manager.add_features_to_node(0x80,mask_to_features_dic)exceptBlueSTInvalidFeatureBitMaskExceptionase:printe# Synchronous discovery of Bluetooth devices.manager.discover(False,SCANNING_TIME_s)Otherwise, you can register the feature after discovering a node and before connecting to it:# Adding a 'FeatureHeartRate' feature to a Nucleo device and mapping it to# the standard '00002a37-0000-1000-8000-00805f9b34fb' Heart Rate Measurement# characteristic.map=UUIDToFeatureMap()map.put(uuid.UUID('00002a37-0000-1000-8000-00805f9b34fb'),feature_heart_rate.FeatureHeartRate)node.add_external_features(map)# Connecting to the node.node.connect()LicenseCOPYRIGHT(c) 2019 STMicroelectronicsRedistribution and use in source and binary forms, with or without
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