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[gpsd-dev] Nokia MEIF (Measurement Engine - Position Engine) Interface s
From: |
TJ |
Subject: |
[gpsd-dev] Nokia MEIF (Measurement Engine - Position Engine) Interface support? |
Date: |
Tue, 06 Aug 2013 18:34:54 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130623 Thunderbird/17.0.7 |
As a result of recently joining the FSF supported Replicant project [1], which
aims to create a totally Free Android-derived operating system with no binary
blobs, I've begun work on reverse
engineering the Nokia Measurement Engine - Position Engine Interface (MEIF)
protocol used in Global Locate/Broadcom GPS/GNSS chip-sets and the Global
Locate Library (GLL) supplied by Broadcom to its
customers.
Many PDAs (a.k.a 'smart' phones) utilise chip-sets that use the MEIF protocol
including recent Samsung models, the Open Moko GTA01, and more that I'm not yet
aware of. Without a Free implementation of
an MEIF-compliant position engine many devices are going to lose critical
functionality when Free operating systems are installed, unless binary blobs
with proprietary copyright licenses are co-mingled.
Nokia created the MEIF protocol specification in 2006 and continues to develop
and license it to other organisations under an NDA [2].
I've already done a large amount of background research and code analysis to
understand where the protocol came from, which chip-sets use it, and how it
works which I've published to my gitorious
"MEIF Protocol" project [3]. The HTML files in the project (generated from
Markdown text) are hosted on my own project web-site [4].
I am interested in discovering:
* other hackers who would like to assist in the reverse-engineering of the
protocol
* developers to implement the protocol from the resulting API and protocol
specification
I believe - please correct me if I'm wrong - that it is important that the
reverse engineering and implementation are done by different developers to
preserve a verifiable 'white-room' implementation.
Therefore I (and others) can figure out the protocol but others will have to
write the implementation code.
Currently, the Broadcom GLL API has provision to provide NMEA-0183 data streams
to OS and applications location services. The GLL is a sophisticated piece of
software that does the A-GNSS heavy-lifting.
I'm interested in views on how best the MEIF support should be implemented. My
current thoughts are that the MEIF protocol interface, A-GNSS services, and
position engine services should each be in
separate L-GPL licensed libraries, and that gpsd can link to the position
engine to use a NMEA-0813 socket.
Tj.
Nottinghamshire, U.K.
[1] http://replicant.us/
[2]
http://developer.nokia.com/info/sw.nokia.com/id/b265d3aa-8198-4eb0-a0e3-077748ccea40/MEIF_Specification_License.pdf.html
[3] https://gitorious.org/meif_protocol/
[4] https://iam.tj/projects/meif_protocol/
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