CHPP Release Notes

A summary of notable changes is provided in the form of release notes. Dates are provided as yyyy-mm-dd. Note that this is not meant to be a detailed change log; for a detailed change list please refer to git commits.

2020-03-04 (4c668b3)

Initial release of CHPP.

  • CHPP transport and app layers
  • Loopback testing service

2020-07-28 (7cebe57)

This release enables service integration with WWAN / WiFi / GNSS devices based on the CHRE PAL API.

  • New functionality

    • Reset and reset-ack implementation to allow either peer to initialize the other (e.g. upon boot)
    • Discovery service to provide list of services
    • Discovery client to match clients with discovered services
    • Standard WWAN service based on the CHRE PAL API
    • Standard WiFi service based on the CHRE PAL API
    • Standard GNSS service based on the CHRE PAL API
    • Standard WWAN client based on the CHRE PAL API

  • Updates and bug fixes to existing layers, including

    • Better logging to assist verification and debugging
    • Error replies are sent over the wire for transport layer errors
    • Over-the-wire preamble has been corrected (byte shifting error)

  • API and integration changes

    • App layer header now includes an error code
    • App layer message type now occupies only the least significant nibble (LSN). The most significant nibble (MSN) is reserved
    • chppPlatformLinkSend() now returns an error code instead of a boolean
    • Added initialization, deinitialization and reset functionality for the link layer (see link.h)
    • Condition variables functionality needs to be supported alongside other platform functionality (see chpp/platform/)
    • Name changes for the logging APIs

2020-08-07 (0b41306)

This release contains bug fixes as well as the loopback client.

  • New functionality

    • Loopback client to run and verify a loopback test using a provided data buffer

  • Cleanup and bug fixes

    • Corrected sequence number handling
    • Updated log messages
    • More accurate casting into enums

2020-08-27 (this)

This release contains additional clients, a virtual link layer for testing (e.g., using loopback), and several important bug fixes.

  • New functionality

    • Basic implementation of the standard WiFi client based on the CHRE PAL API
    • Basic implementation of the standard GNSS client based on the CHRE PAL API
    • Virtual link layer that connects CHPP with itself on Linux to enable testing, including reset, discovery, and loopback

  • Cleanup and bug fixes

    • Client implementation cleanup
    • Client-side handling of close responses
    • Reset / reset-ack handshaking mechanism fixed
    • Loopback client fixed
    • Enhanced log messages
    • Service command #s are now sequential

  • API and integration changes

    • Platform-specific time functionality (platform_time.h)