Nerves Bluetooth

This project enables Bluetooth support for Nerves.

Bluetooth Spec Abstracts

• Litte Endian, Least Significant Bit first

List of BLE HCI commands

Sell Vol 2, Section E, 3.1

HCI Command structure

See Vol 2, Section E, 5.4.1, figure 5.1, p732

• Maximum length per Command Package 255 bytes excluding HCI command header (3 bytes)
• Command Header:
• 2 Byte opcode: Opcode Group Field (OFG, upper 6 Bit), Opcode Command Field (OCF, 10 Bit)
• 1 Byte number of parameter bytes (not parameters!)
• 0..255 bytes of parameters

HCI ACL data packages

See Vol 2, Section E, 5.4.2, figure 5.2, p733

• Maximum length: 27 bytes plus HCI ACL header (4 bytes)
• ACL Header:
• Handle (lower 12 bit)
• Packet Boundary Flag (2 bit)
• Broadcast Flag (2 bit: 00 point2point, 01: active slave broadcast)
• total data length (16 bit)

HCI Synchronous Data (HCI SCO, eSCO)

See Vol 2, Section E, 5.4.3, figure 5.3, p736

HCI Event Data

See Vol 2, Section E, 5.4.4, figure 5.4, p738

• Maximal length of 255 bytes plus Event Header (2 byte)
• Event Heder:
  • Event code (1 byte)
  • number of Event parameter bytes (1 byte)

Targets

Nerves applications are configured that they can produce images for target hardware by setting NERVES_TARGET. By default, if MIX_TARGET is not set, Nerves defaults to building a host target. This is useful for executing logic tests, running utilities, and debugging. For more information about targets: https://hexdocs.pm/nerves/targets.html#content

Getting Started

To start your Nerves app:

• export NERVES_TARGET=my_target or prefix every command with NERVES_TARGET=my_target, Example: NERVES_TARGET=rpi3
• Install dependencies with mix deps.get
• Create firmware with mix firmware
• Burn to an SD card with mix firmware.burn

Learn more

• Official docs: https://hexdocs.pm/nerves/getting-started.html
• Official website: http://www.nerves-project.org/
• Discussion Slack elixir-lang #nerves (Invite)
• Source: https://github.com/nerves-project/nerves