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  • The Host Controller Interface protocol is designed

  • to expose the firmware services to an external host controller.

  • A detailed feature description is given in corresponding HCI specification.

  • HCI minimizes transmission and processing time due to its binary character in comparison

  • to an ASCII based protocol.

  • The communication between host and the radio is based on HCI messages which can be sent

  • through a UART interface.

  • The HCI protocol defines three different types of messages:

  • 1.

  • Command Messages: always sent from the host controller to the radio module to trigger

  • a function.

  • 2.

  • Response Messages: sent from the radio module to the host controller to answer a preceding

  • HCI request message.

  • 3.

  • Event Messages: can be sent from the radio module to the host controller at any time

  • to indicate an event or to pass data which was received over the radio

  • over the radio link from a peer device.

  • An HCI message consists of a “Destination Endpoint Identifierand a ”Message Identifier”.

  • TheDestination Endpoint Identifieris used to separate between groups of functionalities,

  • likeDevice ManagementorLoRaWAN Radio Services”.

  • The functionalities within a group are distinguished byMessage Identifiersfollowed by the

  • payload of the corresponding message.

  • The HCI messages are protected by a 16 bit Frame Check Sum.

  • Afterwards the binary bit stream

  • is SLIP (Serial Line Interface Protocol) encoded.

  • There are 2 endpoint identifier:

  • - Device Management Endpoint Identifier - LoRaWAN Endpoint Identifier

  • Message Identifier identifies a specific type of message and is used to trigger a corresponding

  • service function or to indicate a service response or event when sent to the host controller.

  • This example shows the output of a request for Get Firmware Information,

  • which corresponds to the Device Management Endpoint Identifier 0x05.

  • The downlink message contains the following information:

  • - Endpoint and Message ID. - Status byte.

  • - Firmware information field which contains:

  • - FW version: In this case 1.16 which correspond with 1001

  • - Build counter: 72 which correspond with 4800 in Hex.

  • Then the date of this version, the Name of Firmware integrated LoRaWAN radio stack

  • band support and application, separated by semicolon

  • All of these parameters are defined in WiMOD LoRaWAN EndNode Modem HCI Specification.

The Host Controller Interface protocol is designed

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LoRaWAN HCI (Host Controller Interface) (LoRaWAN HCI (Host Controller Interface))

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    Ed に公開 2021 年 01 月 14 日
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