2017-12-06 15:10:58 +00:00
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# BLEach: a fully open-source IPv6-over-BLE stack for Constrained Embedded IoT Devices
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## Overview
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In 2015, the IETF released the [RFC 7668][rfc7668] that specifies how IPv6 packets
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can be exchanged using BLE connections (IPv6 over BLE).
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This Contiki extenstion implements [BLEach][bleachWeb], a fully open-source IPv6-over-BLE stack for Contiki.
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BLEach in Contiki-NG can be used for node (BLE slave) devices.
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It was developed by
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2017-12-15 10:35:16 +00:00
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* [Michael Spoerk](http://www.michaelspoerk.com), Graz University of Technology, michael.spoerk@tugraz.at, github user: [spoerk](https://github.com/spoerk)
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2017-12-06 15:10:58 +00:00
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This IPv6-over-BLE stack is presented and evaluated in the paper:
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[BLEach: Exploiting the Full Potential of IPv6 over BLE in Constrained Embedded IoT Devices](http://sensys.acm.org/2017/), ACM SenSys'17.
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## Features
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This implementation includes:
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* IPv6-over-BLE node implementation compliant to [RFC 7668][rfc7668]
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* connect to a single IPv6-over-BLE border router
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* maximum IPv6 packet length of 1280 bytes
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* BLE L2CAP channels in LE credit-based flow control mode
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* BLE link layer support for version [4.1][bleSpec]:
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* BLE advertisement
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* BLE connection slave
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It has been tested on the TI CC2650 SensorTag and the TI CC2650 LaunchPad hardware.
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## Modules
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The IPv6-over-BLE stack comes with the following modules:
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### BLE radio
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The implementation of the BLE radio for the TI CC26xx platform is implemented in `arch/cpu/cc26xx-cc13xx/rf-core/ble-cc2650.c`
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and `arch/cpu/cc26xx-cc13xx/rf-core/ble-hal/*.[ch]`.
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These files contain all the hardware specific code for supporting BLE as a link layer.
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### BLE L2CAP layer
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The L2CAP LE credit-based flow control support is implemented in `arch/cpu/cc26xx-cc13xx/rf-core/ble-l2cap.c`.
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Besides implementing rudimentary L2CAP support, this module handles fragmentation of large IPv6 packets.
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## Using BLEach
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Currently, BLEach is only available for the Texas Instruments CC2650 hardware platform.
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The following sections describe how to configure BLEach for IPv6-over-BLE nodes and border routers.
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### IPv6-over-BLE node (BLE slave)
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To enable IPv6 over BLE, the project conf needs to contain:
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```
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#define PACKETBUF_CONF_SIZE 1280
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#define QUEUEBUF_CONF_NUM 1
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#define UIP_CONF_BUFFER_SIZE 1280
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#define NETSTACK_CONF_RADIO ble_cc2650_driver
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#define NETSTACK_CONF_MAC ble_l2cap_driver
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#define RTIMER_CONF_MULTIPLE_ACCESS 1
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/* 6LoWPAN settings */
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#define SICSLOWPAN_CONF_MAC_MAX_PAYLOAD 1280
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#define SICSLOWPAN_CONF_COMPRESSION SICSLOWPAN_COMPRESSION_HC06
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#define SICSLOWPAN_CONF_COMPRESSION_THRESHOLD 0 /* always use compression */
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#define SICSLOWPAN_CONF_FRAG 0
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#define SICSLOWPAN_FRAMER_HDRLEN 0
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/* network stack settings */
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#define UIP_CONF_ROUTER 0
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#define UIP_CONF_ND6_SEND_NA 1
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```
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The following optional parameter can be used to configure that BLE advertisement behaviour:
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```
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#define BLE_CONF_DEVICE_NAME "TI CC26xx device"
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#define BLE_CONF_ADV_INTERVAL 25
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```
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`BLE_CONF_DEVICE_NAME` holds the device name that is used for advertisement, `BLE_CONF_ADV_INTERVAL`
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specifies the used advertisement interval in milliseconds.
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[rfc7668]: https://tools.ietf.org/html/rfc7668
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[bleSpec]: https://www.bluetooth.com/specifications/bluetooth-core-specification/legacy-specifications
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[bleachWeb]: http://www.iti.tugraz.at/BLEach
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