IPv6 over BLE
In 2015, the IETF released the RFC 7668 that specifies how IPv6 packets can be exchanged using BLE connections (IPv6 over BLE). This Contiki-NG extenstion implements BLEach, a fully open-source IPv6-over-BLE stack for Contiki-NG. Currently, BLEach can be used for IPv6-over-BLE node devices that act as a BLE slave device.
It was developed by
This IPv6-over-BLE stack is presented and evaluated in the paper: BLEach: Exploiting the Full Potential of IPv6 over BLE in Constrained Embedded IoT Devices, ACM SenSys’17.
This implementation includes:
IPv6-over-BLE node implementation compliant to RFC 7668
connect to a single IPv6-over-BLE border router
maximum IPv6 packet length of 1280 bytes
BLE L2CAP channels in LE credit-based flow control mode
BLE link layer support for version 4.1:
BLE connection slave
BLE connection master
It has been tested on the TI CC2650 SensorTag and the TI CC2650 LaunchPad hardware.
BLEach comes with the following modules:
The implementation of the BLE radio for the TI CC26xx platform is implemented in
These files contain all the hardware specific code for supporting BLE as a link layer.
BLE L2CAP layer
The L2CAP LE credit-based flow control support is implemented in
Besides implementing rudimentary L2CAP support, this module handles fragmentation of large IPv6 packets.
A simple IPv6-over-BLE UDP-client is included under
For IPv6-over-BLE support, IPv6 needs to be enabled and RPL needs to disabled in Contiki-NG:
MAKE_MAC = MAKE_MAC_BLE MAKE_NET = MAKE_NET_IPV6
Currently, BLEach is only available for the Texas Instruments CC2650 hardware platform.
The following sections describe how to configure BLEach for IPv6-over-BLE nodes.
IPv6-over-BLE node (BLE slave)
To enable IPv6 over BLE, the project configuration needs to contain:
#define PACKETBUF_CONF_SIZE 1280 #define QUEUEBUF_CONF_NUM 1 #define UIP_CONF_BUFFER_SIZE 1280 #define NETSTACK_CONF_RADIO ble_cc2650_driver /* 6LoWPAN settings */ #define SICSLOWPAN_CONF_MAC_MAX_PAYLOAD 1280 #define SICSLOWPAN_CONF_COMPRESSION SICSLOWPAN_COMPRESSION_HC06 #define SICSLOWPAN_CONF_COMPRESSION_THRESHOLD 0 /* always use compression */ #define SICSLOWPAN_CONF_FRAG 0 #define SICSLOWPAN_FRAMER_HDRLEN 0 /* network stack settings */ #define UIP_CONF_ROUTER 0 #define UIP_CONF_ND6_SEND_NA 1
The following optional parameter can be used to configure that BLE advertisement behaviour:
#define BLE_CONF_DEVICE_NAME "TI CC26xx device" #define BLE_CONF_ADV_INTERVAL 25
BLE_CONF_DEVICE_NAME holds the device name that is used for advertisement,
specifies the used advertisement interval in milliseconds.