152 lines
6.8 KiB
Markdown
152 lines
6.8 KiB
Markdown
# BLE peripheral example
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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This example creates GATT server and then starts advertising, waiting to be connected to a GATT client.
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It uses ESP32's Bluetooth controller and NimBLE stack based BLE host.
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This example aims at understanding GATT database configuration, advertisement and SMP related NimBLE APIs.
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It also demonstrates security features of NimBLE stack. SMP parameters like I/O capabilities of device, Bonding flag, MITM protection flag and Secure Connection only mode etc., can be configured through menuconfig options.
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For RPA feature (currently Host based privacy feature is supported), use API `ble_hs_pvcy_rpa_config` to enable/disable host based privacy. `own_addr_type` needs to be set to `BLE_ADDR_RANDOM` to use this feature.
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To test this demo, any BLE scanner app can be used.
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A Python based utility `bleprph_test.py` is also provided (which will run as a BLE GATT Client) and can be used to test this example.
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Note :
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* Make sure to run `python -m pip install --user -r $IDF_PATH/requirements.txt -r $IDF_PATH/tools/ble/requirements.txt` to install the dependency packages needed.
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* Currently this Python utility is only supported on Linux (BLE communication is via BLuez + DBus).
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## How to use example
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### Configure the project
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```
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idf.py menuconfig
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```
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* Set serial port under Serial Flasher Options.
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* Select I/O capabilities of device from 'Example Configuration > I/O Capability', default is 'Just_works'.
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* Enable/Disable other security related parameters 'Bonding, MITM option, secure connection(SM SC)' from 'Example Configuration'.
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### Build and Flash
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Build the project and flash it to the board, then run monitor tool to view serial output:
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```
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idf.py -p PORT flash monitor
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```
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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There is this console output when bleprph is connected and characteristic is read:
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```
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I (118) BTDM_INIT: BT controller compile version [fe7ced0]
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I (118) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
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W (128) phy_init: failed to load RF calibration data (0xffffffff), falling back to full calibration
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I (268) phy: phy_version: 4100, 6fa5e27, Jan 25 2019, 17:02:06, 0, 2
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I (508) NimBLE_BLE_PRPH: BLE Host Task Started
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I (508) uart: queue free spaces: 8
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GAP procedure initiated: stop advertising.
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Device Address: xx:xx:xx:xx:xx:xx
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GAP procedure initiated: advertise; disc_mode=2 adv_channel_map=0 own_addr_type=0 adv_filter_policy=0 adv_itvl_min=0 adv_itvl_max=0
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connection established; status=0 handle=0 our_ota_addr_type=0 our_ota_addr=xx:xx:xx:xx:xx:xx our_id_addr_type=0 our_id_addr=xx:xx:xx:xx:xx:xx peer_ota_addr_type=1 peer_ota_addr=xx:xx:xx:xx:xx:xx peer_id_addr_type=1 peer_id_addr=xx:xx:xx:xx:xx:xx conn_itvl=39 conn_latency=0 supervision_timeout=500 encrypted=0 authenticated=0 bonded=0
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connection updated; status=0 handle=0 our_ota_addr_type=0 our_ota_addr=xx:xx:xx:xx:xx:xx our_id_addr_type=0 our_id_addr=xx:xx:xx:xx:xx:xx peer_ota_addr_type=1 peer_ota_addr=xx:xx:xx:xx:xx:xx peer_id_addr_type=1 peer_id_addr=xx:xx:xx:xx:xx:xx conn_itvl=6 conn_latency=0 supervision_timeout=500 encrypted=0 authenticated=0 bonded=0
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I (50888) NimBLE_BLE_PRPH: PASSKEY_ACTION_EVENT started
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I (50888) NimBLE_BLE_PRPH: Passkey on device's display: xxxxxx
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I (50888) NimBLE_BLE_PRPH: Accept or reject the passkey through console in this format -> key Y or key N
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key Y
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I (50898) NimBLE_BLE_PRPH: ble_sm_inject_io result: 0
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encryption change event; status=0 handle=0 our_ota_addr_type=0 our_ota_addr=xx:xx:xx:xx:xx:xx our_id_addr_type=0 our_id_addr=xx:xx:xx:xx:xx:xx peer_ota_addr_type=1 peer_ota_addr=xx:xx:xx:xx:xx:xx peer_id_addr_type=1
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peer_id_addr=xx:xx:xx:xx:xx:xx conn_itvl=6 conn_latency=0 supervision_timeout=500 encrypted=1 authenticated=1 bonded=1
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connection updated; status=0 handle=0 our_ota_addr_type=0 our_ota_addr=xx:xx:xx:xx:xx:xx our_id_addr_type=0 our_id_addr=xx:xx:xx:xx:xx:xx
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peer_ota_addr_type=1 peer_ota_addr=xx:xx:xx:xx:xx:xx peer_id_addr_type=1 peer_id_addr=xx:xx:xx:xx:xx:xx conn_itvl=39 conn_latency=0 supervision_timeout=500 encrypted=1 authenticated=1 bonded=1
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```
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## Running Python Utility
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```
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python bleprph_test.py
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```
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## Python Utility Output
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This is this output seen on the python side on successful connection:
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```
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discovering adapter...
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bluetooth adapter discovered
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powering on adapter...
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bluetooth adapter powered on
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Started Discovery
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Connecting to device...
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Connected to device
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Services
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[dbus.String(u'00001801-0000-1000-8000-00805f9b34fb', variant_level=1), dbus.String(u'59462f12-9543-9999-12c8-58b459a2712d', variant_level=1)]
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Characteristics retrieved
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Characteristic: /org/bluez/hci0/dev_xx_xx_xx_xx_xx_xx/service000a/char000b
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Characteristic UUID: 5c3a659e-897e-45e1-b016-007107c96df6
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Value: dbus.Array([dbus.Byte(45), dbus.Byte(244), dbus.Byte(81), dbus.Byte(88)], signature=dbus.Signature('y'))
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Properties: : dbus.Array([dbus.String(u'read')], signature=dbus.Signature('s'), variant_level=1)
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Characteristic: /org/bluez/hci0/dev_xx_xx_xx_xx_xx_xx/service000a/char000d
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Characteristic UUID: 5c3a659e-897e-45e1-b016-007107c96df7
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Value: dbus.Array([dbus.Byte(0)], signature=dbus.Signature('y'))
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Properties: : dbus.Array([dbus.String(u'read'), dbus.String(u'write')], signature=dbus.Signature('s'), variant_level=1)
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Characteristic: /org/bluez/hci0/dev_xx_xx_xx_xx_xx_xx/service0006/char0007
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Characteristic UUID: 00002a05-0000-1000-8000-00805f9b34fb
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Value: None
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Properties: : dbus.Array([dbus.String(u'indicate')], signature=dbus.Signature('s'), variant_level=1)
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Characteristics after write operation
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Characteristic: /org/bluez/hci0/dev_xx_xx_xx_xx_xx_xx/service000a/char000b
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Characteristic UUID: 5c3a659e-897e-45e1-b016-007107c96df6
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Value: dbus.Array([dbus.Byte(45), dbus.Byte(244), dbus.Byte(81), dbus.Byte(88)], signature=dbus.Signature('y'))
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Properties: : dbus.Array([dbus.String(u'read')], signature=dbus.Signature('s'), variant_level=1)
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Characteristic: /org/bluez/hci0/dev_xx_xx_xx_xx_xx_xx/service000a/char000d
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Characteristic UUID: 5c3a659e-897e-45e1-b016-007107c96df7
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Value: dbus.Array([dbus.Byte(65)], signature=dbus.Signature('y'))
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Properties: : dbus.Array([dbus.String(u'read'), dbus.String(u'write')], signature=dbus.Signature('s'), variant_level=1)
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Characteristic: /org/bluez/hci0/dev_xx_xx_xx_xx_xx_xx/service0006/char0007
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Characteristic UUID: 00002a05-0000-1000-8000-00805f9b34fb
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Value: None
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Properties: : dbus.Array([dbus.String(u'indicate')], signature=dbus.Signature('s'), variant_level=1)
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exiting from test...
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disconnecting device...
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device disconnected
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powering off adapter...
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bluetooth adapter powered off
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```
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## Note
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* NVS support is not yet integrated to bonding. So, for now, bonding is not persistent across reboot.
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