ETSI TS 103 544-5 V1.3.1 (2019-10)

ETSI TS 103 544-5 V1.3.1 (2019-10)






TECHNICAL SPECIFICATION
Publicly Available Specification (PAS);
Intelligent Transport Systems (ITS);
®
MirrorLink ;
Part 5: Common Data Bus (CDB)
CAUTION
The present document has been submitted to ETSI as a PAS produced by CCC and
approved by the ETSI Technical Committee Intelligent Transport Systems (ITS).
CCC is owner of the copyright of the document CCC-TS-016 and/or had all relevant rights and had assigned said rights to
ETSI on an "as is basis". Consequently, to the fullest extent permitted by law, ETSI disclaims all warranties whether express,
implied, statutory or otherwise including but not limited to merchantability, non-infringement of any intellectual property rights of
third parties. No warranty is given about the accuracy and the completeness of the content of the present document.

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2 ETSI TS 103 544-5 V1.3.1 (2019-10)



Reference
RTS/ITS-98-5
Keywords
interface, ITS, PAS, smartphone

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Important notice
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The copyright and the foregoing restriction extend to reproduction in all media.
©ETSI 2019.
© Car Connectivity Consortium 2011-2018.
All rights reserved.
ETSI logo is a Trade Mark of ETSI registered for the benefit of its Members.
MirrorLink® is a registered trademark of Car Connectivity Consortium LLC.
RFB® and VNC® are registered trademarks of RealVNC Ltd.
UPnP® is a registered trademark of Open Connectivity Foundation, Inc.
Other names or abbreviations used in the present document may be trademarks of their respective owners.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners.
®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI

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3 ETSI TS 103 544-5 V1.3.1 (2019-10)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definition of terms, symbols and abbreviations . 5
3.1 Terms . 5
3.2 Symbols . 5
3.3 Abbreviations . 6
4 Common Data Bus Architecture . 6
4.1 General Architecture . 6
4.2 Bindings . 6
4.2.1 TCP Binding . 6
4.2.1.1 Launching the Common Data Bus . 6
4.2.1.2 Intentionally Terminating the Common Data Bus . 7
4.2.1.3 Unintentionally Terminating the CDB Session . 7
4.2.2 Other Bindings . 8
4.3 Testing Considerations . 8
5 Message Types and Format . 8
5.1 Message Overview . 8
5.2 ServicesRequest . 8
5.3 ServicesSupported . 9
5.4 StartService . 11
5.5 StopService. 12
5.6 ServicePayload . 12
5.7 ServiceResponse . 13
5.8 ByeBye . 14
5.9 Ping . 14
5.10 PingResponse . 14
6 Message Flow . 15
Annex A (informative): Authors and Contributors . 17
History . 18


ETSI

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4 ETSI TS 103 544-5 V1.3.1 (2019-10)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Intelligent Transport Systems
(ITS).
The present document is part 5 of a multi-part deliverable. Full details of the entire series can be found in part 1 [i.1].
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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5 ETSI TS 103 544-5 V1.3.1 (2019-10)
1 Scope
®
The present document is part of the MirrorLink specification which specifies an interface for enabling remote user
interaction of a mobile device via another device. The present document is written having a vehicle head-unit to interact
with the mobile device in mind, but it will similarly apply for other devices, which provide a colour display, audio
input/output and user input mechanisms.
The Common Data Bus (CDB) is a simple, low-bandwidth shared bus, which allows exchanging data between two
CDB endpoints, residing in the MirrorLink Server and Client. The Common Data Bus is fully symmetrical, i.e. services
can be provided on both endpoints independently from each other.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 103 544-9 (V1.3.1): "Publicly Available Specification (PAS); Intelligent Transport
Systems (ITS); MirrorLink®; Part 9: UPnP Application Server Service".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI TS 103 544-1 (V1.3.1): "Publicly Available Specification (PAS); Intelligent Transport
Systems (ITS); MirrorLink®; Part 1: Connectivity".
3 Definition of terms, symbols and abbreviations
3.1 Terms
Void.
3.2 Symbols
Void.
ETSI

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6 ETSI TS 103 544-5 V1.3.1 (2019-10)
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
API Application Programming Interface
CCC Car Connectivity Consortium
CDB Common Data Bus
DAP Device Attestation Protocol
IP Internet Protocol
TCP Transmission Control Protocol
UPnP Universal Plug-and-Play
URL Universal Resource Locator
VNC Virtual Networking Computing
4 Common Data Bus Architecture
4.1 General Architecture
The Common Data Bus (CDB) is a simple, low-bandwidth shared bus, which allows exchanging data between two
CDB endpoints, residing in the MirrorLink Server and Client. The Common Data Bus is fully symmetrical, i.e. services
can be provided on both endpoints independently from each other.
A CDB endpoint can host a CDB Sink endpoint and a CDB Source endpoint. CDB Sink endpoints are subscribing to
data services provided from CDB Source endpoints. A CDB source endpoint can provide multiple data services from
data sources. A CDB sink endpoint can deliver data from multiple data sources to multiple data sinks. The endpoints are
responsible for marshalling and de-marshalling of all the data from multiple applications passing through the common
data bus. A CDB data sink subscribes to a service, provided from a data source service. For simplicity, the following
figure shows two CDB services, which one data source and data sink each.

Figure 1: Common Data Bus Architecture with TCP binding
4.2 Bindings
4.2.1 TCP Binding
4.2.1.1 Launching the Common Data Bus
The MirrorLink Server, providing Common Data Bus functionality, shall include the Common Data Bus into its
application listing as specified in [1]. The MirrorLink Client shall identify the Common Data Bus from the application
listing as specified in [1].
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7 ETSI TS 103 544-5 V1.3.1 (2019-10)
The Common Data Bus shall be started from the MirrorLink Client, using the UPnP TmApplicationServer:1 service
LaunchApplication action [1]. The MirrorLink Client's CDB endpoint shall open a TCP connection to the Server's CDB
endpoint, using the returned URL from the LaunchApplication action.
The MirrorLink Client should launch the MirrorLink Server's CDB endpoint not later than 10s after receiving the first
A_ARG_TYPE_AppList response from the MirrorLink Server.
The MirrorLink Client shall have launched the MirrorLink Server's CDB prior starting the first VNC based remote
application.
4.2.1.2 Intentionally Terminating the Common Data Bus
The MirrorLink Client and Server can terminate the Server's Common Data Bus endpoint anytime, using the CDB
ByeBye message and the UPnP TmApplicationServer:1 services, as defined in [1].
The CDB endpoint in the MirrorLink Client shall use the following sequence to terminate the CDB operation:
1) Client CDB endpoint shall send a CDB ByeBye message. The CDB Client shall not send any further CDB
messages, after sending the CDB ByeBye message. The CDB Client endpoint should ignore all incoming CDB
messages, after sending a CDB ByeBye message.
2) Server CDB endpoint shall respond with a CDB ByeBye message.
3) Client CDB endpoint shall disconnect the TCP connection. The CDB Client should disconnect the TCP
connection, if it does not receive the CDB ByeBye message back within 5 s.
4) CDB Server should disconnect the TCP connection on detection of the Client TCP disconnect or 5 s after
sending the CDB ByeBye message, whatever comes first.
Client CDB endpoint should send a UPnP TmApplicationServer:1 service TerminateApplication action for the server
CDB endpoint.
The CDB endpoint in the MirrorLink Server shall use the following sequence to terminate the CDB operation:
1) Server CDB endpoint shall send a CDB ByeBye message. The Server CDB endpoint shall not send any further
CDB messages after sending the CDB ByeBye message. The CDB endpoint should ignore all incoming CDB
messages, after sending a CDB ByeBye message.
2) Client CDB endpoint shall disconnect the TCP connection.
3) Server CDB endpoint shall signal the CDB endpoint's termination to the Client, if it has subscribed to the
TmApplicationServer:1 AppStatusUpdate event.
4) Server CDB endpoint should disconnect the TCP connection on detection of the Client TCP disconnect or 5s
after sending the CDB ByeBye message, whatever comes first.
If the CDB is terminated prior to the establishment of the TCP connection, steps 1, 2 and 4 shall be omitted.
4.2.1.3 Unintentionally Terminating the CDB Session
Unintentional termination of the CDB session may happen any time in case of error conditions. In this case the
respective CDB Server or Client endpoint will disconnect the TCP connection. The respective counterpart should
disconnect as well.
If the MirrorLink Client decides to re-establish the CDB session, it shall follow the steps given in clause 4.2.1.1.
To avoid the CDB Server or Client endpoint being in a TCP TIME-WAIT time-out loop, as a result of an unintentional
active disconnect, the TCP socket should be established using the SO_REUSEADDR option (or similar platform
specific variants), allowing the operating system to reuse a port address, even it is currently in the TIME-WAIT state or
the CDB Server endpoint should use a different, unaffected port.
ETSI

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8 ETSI TS 103 544-5 V1.3.1 (2019-10)
4.2.2 Other Bindings
Besides TCP/IP, it will be also possible to run MirrorLink Common Data Bus on top of other protocol like Bluetooth
RFCOMM, but how to discover and establish connection for such configuration is outside the scope of the present
document.
4.3 Testing Considerations
If the MirrorLink Client is in a dedicated testing state (as part of the MirrorLink Certification), it shall launch a new
CDB session (either initiated automatically or manually from the user), whenever the CDB Server endpoint has
intentionally terminated the CDB session.
If the MirrorLink Client is in a dedicated testing state (as part of the MirrorLink Certification), it shall launch a new
CDB session (either initiated automatically or manually from the user), whenever the CDB Server endpoint has
unintentionally terminated the CDB session.
5 Message Types and Format
5.1 Message Overview
The Common Data Bus (CDB) defines the following messages, which are specified in more detail in the following
paragraphs:
• ServicesRequest: Requests the list of supported services
• ServicesSupported: Provide a list of supported data services
• StartService: Request to start a specific service
• StopService: Request to stop a specific service
• Servi
...