Skip to content

Files

Latest commit

 Cannot retrieve latest commit at this time.

History

History
642 lines (440 loc) · 21.4 KB

getting_started_with_xbee_python_library.rst

File metadata and controls

642 lines (440 loc) · 21.4 KB

Get started with XBee Python library

This getting started guide describes how to set up your environment and use the XBee Python Library to communicate with your XBee devices. It explains how to configure your modules and write your first XBee Python application.

The guide is split into 3 main sections:

Install your software

The following software components are required to write and run your first XBee Python application:

Python 3

The XBee Python library requires Python 3. If you don't have Python 3, you can get it from https://www.python.org/getit/.

Warning

The XBee Python library is currently only compatible with Python 3.

PySerial 3

You must be able to communicate with the radio modules over a serial connection. The XBee Python library uses the PySerial module for that functionality.

This module is automatically downloaded when you install the XBee Python library.

SRP

The XBee Python library uses the SRP module to authenticate with XBee devices over Bluetooth Low Energy.

This module is automatically downloaded when you install the XBee Python library.

XBee Python library software

The best way to install the XBee Python library is with the pip tool (which is what Python uses to install packages). The pip tool comes with recent versions of Python.

To install the library, run this command in your terminal application:

$ pip install digi-xbee

The library is automatically downloaded and installed in your Python interpreter.

Get the source code

The XBee Python library is actively developed on GitHub, where the code is always available. You can clone the repository with:

$ git clone git@github.com:digidotcom/xbee-python.git

XCTU

XCTU is a free multi-platform application that enables developers to interact with Digi RF modules through a simple-to-use graphical interface. It includes new tools that make it easy to set up, configure, and test XBee RF modules.

For instructions on downloading and using XCTU, go to:

http://www.digi.com/xctu

Once you have downloaded XCTU, run the installer and follow the steps to finish the installation process.

After you load XCTU, a message about software updates appears. We recommend you always update XCTU to the latest available version.

Configure your XBee modules

You need to configure two XBee devices. One module (the sender) sends “Hello XBee World!” using the Python application. The other device (the receiver) receives the message.

To communicate, both devices must be working in the same protocol (802.15.4, Zigbee, DigiMesh, Point-to-Multipoint, or Wi-Fi) and must be configured to operate in the same network.

Note

If you are getting started with cellular or BLU, you only need to configure one device since there is no network of remote devices to communicate with.

Use XCTU to configure the devices. Plug the devices into the XBee adapters and connect them to your computer’s USB or serial ports.

Note

For more information about XCTU, see the XCTU User Guide. You can also access the documentation from the Help menu of the tool.

Once XCTU is running, add your devices to the tool and then select them from the Radio Modules section. When XCTU is finished reading the device parameters, complete the following steps according to your device type. Repeat these steps to configure your XBee devices using XCTU.

802.15.4 devices

  1. Click Load default firmware settings in the Radio Configuration toolbar to load the default values for the device firmware.
  2. Make sure API mode (API1 or API2) is enabled. To do so, set the AP parameter value to 1 (API mode without escapes) or 2 (API mode with escapes).
  3. Configure ID (PAN ID) setting to CAFE.
  4. Configure CH (Channel setting) to C.
  5. Click Write radio settings in the Radio Configuration toolbar to apply the new values to the module.
  6. Once you have configured both modules, check to make sure they can see each other. Click Discover radio modules in the same network, the second button of the device panel in the Radio Modules view. The other device must be listed in the Discovering remote devices dialog.

Note

If the other module is not listed, reboot both devices by pressing the Reset button of the carrier board and try adding the device again. If the list is still empty, see the product manual for your device.

Zigbee devices

  1. For old Zigbee devices (S2 and S2B), make sure the devices are using API firmware. The firmware appears in the Function label of the device in the Radio Modules view.

    • One of the devices must be a coordinator - Function: Zigbee Coordinator API
    • Digi recommends the other one is a router - Function: Zigbee Router AP.

    Note

    If any of the two previous conditions is not satisfied, you must change the firmware of the device. Click the Update firmware button of the Radio Configuration toolbar.

  2. Click Load default firmware settings in the Radio Configuration toolbar to load the default values for the device firmware.

  3. Do the following:

    • If the device has the AP parameter, set it to 1 (API mode without escapes) or 2 (API mode with escapes).
    • If the device has the CE parameter, set it to Enabled in the coordinator.

  4. Configure ID (PAN ID) setting to C001BEE.

  5. Configure SC (Scan Channels) setting to FFF.

  6. Click Write radio settings in the Radio Configuration toolbar to apply the new values to the module.

  7. Once you have configured both modules, check to make sure they can see each other. Click Discover radio modules in the same network, the second button of the device panel in the Radio Modules view. The other device must be listed in the Discovering remote devices dialog.

Note

If the other module is not listed, reboot both devices by pressing the Reset button of the carrier board and try adding the device again. If the list is still empty, go to the corresponding product manual for your devices.

DigiMesh devices

  1. Click Load default firmware settings in the Radio Configuration toolbar to load the default values for the device firmware.
  2. Ensure the API mode (API1 or API2) is enabled. To do so, the AP parameter value must be 1 (API mode without escapes) or 2 (API mode with escapes).
  3. Configure ID (PAN ID) setting to CAFE.
  4. Configure CH (Operating Channel) to C.
  5. Click Write radio settings in the Radio Configuration toolbar to apply the new values to the module.
  6. Once you have configured both modules, check to make sure they can see each other. Click Discover radio modules in the same network, the second button of the device panel in the Radio Modules view. The other device must be listed in the Discovering remote devices dialog.

Note

If the other module is not listed, reboot both devices by pressing the Reset button of the carrier board and try adding the device again. If the list is still empty, go to the corresponding product manual for your devices.

DigiPoint devices

  1. Click Load default firmware settings in the Radio Configuration toolbar to load the default values for the device firmware.
  2. Ensure the API mode (API1 or API2) is enabled. To do so, the AP parameter value must be 1 (API mode without escapes) or 2 (API mode with escapes).
  3. Configure ID (PAN ID) setting to CAFE.
  4. Configure HP (Hopping Channel) to 5.
  5. Click Write radio settings in the Radio Configuration toolbar to apply the new values to the module.
  6. Once you have configured both modules, check to make sure they can see each other. Click Discover radio modules in the same network, the second button of the device panel in the Radio Modules view. The other device must be listed in the Discovering remote devices dialog.

Note

If the other module is not listed, reboot both devices by pressing the Reset button of the carrier board and try adding the device again. If the list is still empty, go to the corresponding product manual for your devices.

Cellular devices

  1. Click Load default firmware settings in the Radio Configuration toolbar to load the default values for the device firmware.
  2. Ensure the API mode (API1 or API2) is enabled. To do so, the AP parameter value must be 1 (API mode without escapes) or 2 (API mode with escapes).
  3. Click Write radio settings in the Radio Configuration toolbar to apply the new values to the module.
  4. Verify the module is correctly registered and connected to the Internet. To do so check that the LED on the development board blinks. If it is solid or has a double-blink, registration has not occurred properly. Registration can take several minutes.

Note

In addition to the LED confirmation, you can check the IP address assigned to the module by reading the MY parameter and verifying it has a value different than 0.0.0.0.

Wi-Fi devices

  1. Click Load default firmware settings in the Radio Configuration toolbar to load the default values for the device firmware.
  2. Ensure the API mode (API1 or API2) is enabled. To do so, the AP parameter value must be 1 (API mode without escapes) or 2 (API mode with escapes).
  3. Connect to an access point:
    1. Click the Active Scan button.
    2. Select the desired access point from the list of the Active Scan result dialog.
    3. If the access point requires a password, type your password.
    4. Click the Connect button and wait for the module to connect to the access point.
  4. Click Write radio settings in the Radio Configuration toolbar to apply the new values to the module.
  5. Verify the module is correctly connected to the access point by checking the IP address assigned to the module by reading the MY parameter and verifying it has a value different than 0.0.0.0.

BLU devices

  1. Click Load default firmware settings in the Radio Configuration toolbar to load the default values for the device firmware.
  2. Ensure the API mode (API1 or API2) is enabled. To do so, the AP parameter value must be 1 (API mode without escapes) or 2 (API mode with escapes).
  3. Click Write radio settings in the Radio Configuration toolbar to apply the new values to the module.

Run your first XBee Python application

The XBee Python application demonstrated in the guide broadcasts the message Hello XBee World! from one of the devices connected to your computer (the sender) to all remote devices on the same network as the sender. Once the message is sent, the receiver XBee module must receive it. You can use XCTU to verify receipt.

The commands to be executed depend on the protocol of the XBee devices. Follow the corresponding steps depending on the protocol of your XBee devices.

Zigbee, DigiMesh, DigiPoint or 802.15.4 devices

Follow these steps to send the broadcast message and verify that it is received successfully:

  1. First, prepare the receiver XBee device in XCTU to verify that the broadcast message sent by the sender device is received successfully. Follow these steps to do so:

    1. Launch XCTU.
    2. Add the receiver module to XCTU.
    3. Click Open the serial connection with the radio module to switch to Consoles working mode and open the serial connection. This allows you to see the data when it is received.

  2. Open the Python interpreter and write the application commands.

    1. Import the XBeeDevice class by executing the following command:

      > from digi.xbee.devices import XBeeDevice

    2. Instantiate a generic XBee device:

      > device = XBeeDevice("COM1", 9600)

      Note

      Remember to replace the COM port with the one your sender XBee device is connected to. In UNIX-based systems, the port usually starts with /dev/tty.

    3. Open the connection with the device:

      > device.open()

    4. Send the Hello XBee World! broadcast message.

      > device.send_data_broadcast("Hello XBee World!")

    5. Close the connection with the device:

      > device.close()

  3. Verify that the message is received by the receiver XBee in XCTU. An RX (Receive) frame should be displayed in the Console log with the following information:

    Start delimiter

    7E

    Length

    Depends on the XBee protocol

    Frame type

    Depends on the XBee protocol

    16/64-bit source address

    XBee sender's 16/64-bit address

    Options

    02

    RF data/Received data

    48 65 6C 6C 6F 20 58 42 65 65 20 57 6F 72 6C 64 21

Wi-Fi devices

Wi-Fi devices send broadcast data using the send_ip_data_broadcast() command instead of the send_data_broadcast() one. For that reason, you must instantiate a WiFiDevice instead of a generic XBeeDevice to execute the proper command.

Follow these steps to send the broadcast message and verify that it is received successfully:

  1. First, prepare the receiver XBee device in XCTU to verify that the broadcast message sent by the sender device is received successfully by the receiver device.

    1. Launch XCTU.
    2. Add the receiver module to XCTU.
    3. Click Open the serial connection with the radio module to switch to Consoles working mode and open the serial connection. This allows you to see the data when it is received.

  2. Open the Python interpreter and write the application commands.

    1. Import the WiFiDevice class by executing the following command:

      > from digi.xbee.devices import WiFiDevice

    2. Instantiate a Wi-Fi XBee device:

      > device = WiFiDevice("COM1", 9600)

      Note

      Remember to replace the COM port with the one your sender XBee device is connected to. In UNIX-based systems, the port usually starts with /dev/tty.

    3. Open the connection with the device:

      > device.open()

    4. Send the Hello XBee World! broadcast message.

      > device.send_ip_data_broadcast(9750, "Hello XBee World!")

    5. Close the connection with the device:

      > device.close()

  3. Verify that the message is received by the receiver XBee in XCTU. An RX IPv4 frame should be displayed in the Console log with the following information:

    Start delimiter

    7E

    Length

    00 1C

    Frame type

    B0

    IPv4 source address

    XBee Wi-Fi sender's IP address

    16-bit dest port

    26 16

    16-bit source port

    26 16

    Protocol

    00

    Status

    00

    RF data

    48 65 6C 6C 6F 20 58 42 65 65 20 57 6F 72 6C 64 21

Cellular devices

Cellular devices are connected directly to the Internet, so there is no network of remote devices to communicate with them. For cellular protocol, the application demonstrated in this guide differs from other protocols.

The application sends and reads data from an echo server. Follow these steps to execute it:

  1. Open the Python interpreter and write the application commands.

    1. Import the CellularDevice, IPProtocol and IPv4Address classes:

      > from digi.xbee.devices import CellularDevice
> from digi.xbee.models.protocol import IPProtocol
> from ipaddress import IPv4Address

    2. Instantiate a cellular XBee device:

      > device = CellularDevice("COM1", 9600)

      Note

      Remember to replace the COM port by the one your Cellular XBee device is connected to. In UNIX-based systems, the port usually starts with /dev/tty.

    3. Open the connection with the device:

      > device.open()

    4. Send the Hello XBee World! message to the echo server with IP 52.43.121.77 and port 11001 using the TCP IP protocol.

      > device.send_ip_data(IPv4Address("52.43.121.77"), 11001, IPProtocol.TCP, "Hello XBee World!")

    5. Read and print the response from the echo server. If response cannot be received, print ERROR.

      > ip_message = device.read_ip_data()
> print(ip_message.data.decode("utf8") if ip_message is not None else "ERROR")

    6. Close the connection with the device:

      > device.close()

BLU devices

BLU devices are stand alone devices, so there is no network of remote devices to communicate with them. For the BLE protocol, the application demonstrated in this guide differs from other protocols.

The application issues a GAP Scan request and displays the received responses:

  1. Open the Python interpreter and write the application commands.

    1. Import the BluDevice class by executing the following command:

      > from digi.xbee.devices import BluDevice

    2. Instantiate a Blu XBee device:

      > device = BluDevice("COM1", 9600)

      Note

      Remember to replace the COM port with the one your XBee device is connected to. In UNIX-based systems, the port usually starts with /dev/tty.

    3. Open the connection with the device:

      > ble_manager = device.get_ble_manager()
> device.open()

    4. Create a callback function for live GAP scan results:

      > def scan_callback(data):
>     print(data.to_dict())

    5. Register a callback to receive live GAP scan results:

      > ble_manager.add_ble_gap_advertisement_received_callback(scan_callback)

    6. Start a 30 seconds BLE Gap scan:

      > ble_manager.start_ble_gap_scan(30, 10000, 10000, False, "")

    7. Remove the callback and close the connection with the device:

      > ble_manager.del_ble_gap_advertisement_received_callback(scan_callback)
> device.close()