80 lines
2.5 KiB
Markdown
80 lines
2.5 KiB
Markdown
# Bluetooth on the Raspberry Pi Zero W (1 or 2)
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The Zero W series has Bluetooth capability because of the Wifi chip on the board.
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**Warning: This is a work in progress!!!**
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# Reference
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- "Exploring Raspberry Pi" by Derek Molloy pg 537-544
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- [Connecting to a Headless Raspberry Pi using Bluetooth](https://medium.com/@tomw3115/connect-to-a-headless-raspberry-pi-using-bluetooth-0e61c05e1b68)
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- https://github.com/sorah/bluetooth-getty
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- [Use dbus insteadd of sdptool](https://linuxvox.com/blog/bluez-adding-services-attributes-and-profiles-without-sdptool-command/)
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# Getting Bluetooth working
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1. Login to the pi via a USB-serial port or monitor-keyboard-mouse. Configuring bluetooth can sometimes kick you off the wifi.
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1. Tell `rfkill` to unblock bluetooth. Perhaps this is a security thing?
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```
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sudo rfkill unblock bluetooth
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```
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1. Restart the bluetooth service and check it's status
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```
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sudo systemctl restart bluetooth
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sudo systemctl status bluetooth
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```
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1. Figure out the address using `hcitool`
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```
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hcitool dev
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```
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1. If you have a laptop set to be discoverable, you can check if bluetooth is working
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```
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hcitool scan
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```
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1. You can then query that device for what services it offers
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```
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sdptool browse ADDRESS
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```
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1. Now we want to make the Pi discoverable to our phone, tablet, or laptop
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```
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sudo hciconfig hci0 piscan
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sudo hciconfig hci name RaspberryPi
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```
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1. A Serial Port Profile(SPP) is needed for our serial port
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```
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sudo sdptool add SP
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```
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1. For some reason, we have to put the bluetooth daemon in compatibility mode. (True as of 2016-2026 --foley). Find the line with `ExecStart` and put `--compat` at the end
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```
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sudo nano /lib/systemd/system/bluetooth.service
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```
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1. Test the SPP is setup
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```
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sudo sdptool browse local
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```
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1. Time to pair it with a device
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```
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sudo bluetoothctl
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discoverable on
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agent on
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pairable on
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scan on
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```
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and once you have paired it
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```
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discoverable off
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exit
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```
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1. If this works, you can install the `bluetooth.services` and `rfcomm.service` files to automate some of this setup.
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```
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sudo cp bluetooth.service /etc/systemd/system/bluetooth.target.wants/.
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sudo cp rfcomm.service /etc/systemd/system/.
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sudo systemctl daemon-reload
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sudo systemctl enable rfcomm
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sudo reboot
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```
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# Discussion
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Apparently Bluez's `sdptool` is now depricated and they are telling people to use this new GATT via `busctl` or `dbus-send`. [linuxvox article on depricated sdptool](https://linuxvox.com/blog/bluez-adding-services-attributes-and-profiles-without-sdptool-command/)
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