author | Graeme Price <GRAEME.PRICE@NOKIA.COM> |
Fri, 15 Oct 2010 14:32:18 +0100 | |
changeset 15 | 307f4279f433 |
parent 14 | 578be2adaf3e |
permissions | -rw-r--r-- |
14
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-BD8446C5-3ADE-59A6-A13A-A5482D6FC56F" xml:lang="en"><title>Connection |
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Management</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>This topic introduces the concept of Connection Management and the APIs |
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needed to perform Connection Management operations. The APIs discussed include <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref> and <xref href="GUID-B16CAD6D-85B1-3482-AAC0-9BADEDB6ABDD.dita"><apiname>RHostResolver</apiname></xref>. </p> |
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<p>The RConnection API provides: </p> |
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<ul> |
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<li id="GUID-395ABFCE-2A51-5205-B3FF-F85C882AF761"><p>an interface for actively |
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creating and managing connections </p> </li> |
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<li id="GUID-C3A61C1A-72DF-5304-9758-F6C298DF93AD"><p>facilities that are |
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not available when creating connections by other methods. Such facilities |
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include support for multihoming. </p> </li> |
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</ul> |
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<p>Introduced with the <keyword>multihoming</keyword> functionality, which |
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allows multiple Circuit/Packet Switched Data connections to be active. </p> |
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<p><b>Implementation </b> </p> |
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<p>The connection management API is implemented by <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref>. </p> |
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<p> <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref> objects are implemented as sub-sessions |
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to the <xref href="GUID-EF29C1D7-B1E5-370F-AE37-66231A6BE449.dita"><apiname>RSocketServ</apiname></xref>. </p> |
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<p><b>Connections and subconnections </b> </p> |
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<p>An RConnection is the handle for an application onto an underlying interface. |
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(But there may be a number of RConnections per interface). </p> |
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<p>Technologies such as W-CDMA and later releases of GPRS are capable of establishing |
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multiple subconnections within a connection. This is supported by the management |
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interface. </p> |
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<p>Note that all subconnections within a connection will have certain parameters |
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in common, such as the Access Point Name in the case of GPRS and WCDMA. However, |
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each subconnection may have a different Quality-of-Service. </p> |
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<p><b>Guidelines for use </b> </p> |
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<p> <codeph>RConnection</codeph> s need to be opened on an existing socket |
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server session, <xref href="GUID-EF29C1D7-B1E5-370F-AE37-66231A6BE449.dita"><apiname>RSocketServ</apiname></xref>. </p> |
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<p>In the API as a whole, there is an important distinction made between an <codeph>RConnection</codeph> object |
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which has been newly opened on an socket server session but not yet associated |
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with an underlying interface on the server, and one which is opened and associated. |
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There are certain operations that require a <codeph>RConnection</codeph> object |
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to be in the associated state to work successfully. The <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita#GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD/GUID-CB62E838-A380-309C-8B08-1F804EDB4387"><apiname>RConnection::Start()</apiname></xref> and <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita#GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD/GUID-EAB8B0B1-0F5B-31E5-BFD6-B3AE1181868E"><apiname>RConnection::Attach()</apiname></xref> methods |
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are used to associate an <codeph>RConnection</codeph> object with an interface. </p> |
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<p>There is no restriction on the number of <codeph>RConnection</codeph> objects |
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per socket server session. It is also possible for several <codeph>RConnection</codeph> objects |
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to refer to the same underlying interface. For example, several applications, |
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each with its own socket server session and <codeph>RConnection</codeph> object, |
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could refer to the same underlying interface. It is also technically possible |
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for the said <codeph>RConnection</codeph> objects to be on the same socket |
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server session, though this may be somewhat redundant. </p> |
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<p>Rather like <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita"><apiname>RSocket</apiname></xref> /<xref href="GUID-B16CAD6D-85B1-3482-AAC0-9BADEDB6ABDD.dita"><apiname>RHostResolver</apiname></xref> objects, |
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an individual <codeph>RConnection</codeph> object is not designed to be used |
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by multiple clients simultaneously (i.e. have multiple requests outstanding |
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on it from different clients). </p> |
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<p>Although <codeph>RConnection</codeph> objects are automatically closed |
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when the corresponding socket server session is closed, appropriate use of <codeph>CleanupClosePushL(RConnection&)</codeph> is |
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more likely to ensure proper operation. </p> |
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<p> <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita"><apiname>RSocket</apiname></xref> and <xref href="GUID-B16CAD6D-85B1-3482-AAC0-9BADEDB6ABDD.dita"><apiname>RHostResolver</apiname></xref> objects |
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can be associated with an <codeph>RConnection</codeph> object. In this case, |
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data will flow over the same underlying interface as the <codeph>RConnection</codeph> to |
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which they have been associated. For this to work, the <codeph>RSocket/RHostResolver/RConnection</codeph> objects |
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must all be on the same socket server session, and the <codeph>RConnection</codeph> object |
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must have been previously opened and active (i.e. associated with an underlying |
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interface). </p> |
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<section id="GUID-83D1E933-6A85-40C0-A9D0-7F465953DAFB"><title>Connection Management functionality</title> <p> <codeph>RConnection</codeph> provides |
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clients with the following functionality: </p> <ul> |
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<li id="GUID-882DB251-213D-58BF-9398-9ADC68341298"><p>Opening and closing |
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the connection </p> </li> |
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<li id="GUID-E20078EE-FE93-5452-877B-C3F7985142FD"><p>Starting a connection, |
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which means associating it with a new underlying interface </p> </li> |
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<li id="GUID-FBBB3514-280E-5989-AC76-B81DD8CAC8B8"><p>Attaching the <codeph>RConnection</codeph> instance |
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Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
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82 |
to an existing interface </p> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
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83 |
<li id="GUID-BB58A700-B58C-5C26-BD67-688EE0CF55C2"><p>Stopping the connection, |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
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84 |
which means disassociating it from the underlying interface </p> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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85 |
<li id="GUID-A74BD98D-F3A7-5FE4-9F74-60AC2E1FBB78"><p>Obtaining progress information |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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86 |
and notification during connection start-up </p> <p>This is useful because |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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87 |
the process of dialling an ISP, logging in and starting network protocols |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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88 |
can be quite lengthy, taking up to a minute in some cases. In addition, the |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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89 |
application can get the last error which occurred in setting up the connection. </p> <p> </p> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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90 |
<li id="GUID-9AAABE2A-3FB0-5B63-948F-2B3112683B0C"><p>Notifying when subconnections |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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91 |
come up and go down </p> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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92 |
<li id="GUID-418DFF66-415A-510D-AB86-1090EE0DC6B8"><p>Notifying when there |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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93 |
is a service change for the connection </p> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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94 |
<li id="GUID-CF7D3A21-0A1F-537B-AF50-4EDDBB931557"><p>Notifying when a given |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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95 |
amount of data has been sent or received on a connection or subconnection </p> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
diff
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96 |
<li id="GUID-E192532A-F857-5869-B5E0-D657AAFC8290"><p>Reading CommDB fields |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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97 |
specific to an active connection </p> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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98 |
<li id="GUID-1A83A7BD-FA23-5F4F-8D28-A0A24481DB9F"><p>Collecting statistical |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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99 |
information on the network connection and subconnections. A UI component can |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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100 |
display the collected statistical information in order to allow the user to |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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101 |
examine the status of connections. The information that can be gathered is |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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102 |
the following: </p> <ul> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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103 |
<li id="GUID-AF90F93C-DA10-539F-842A-34337C51427F"><p>All available internet |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
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104 |
access point names and internet access point 'friendly' names as appropriate |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
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105 |
for each network (GPRS/UMTS) connection </p> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
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106 |
<li id="GUID-66B29945-C319-5E56-ABCA-301188643CDB"><p>Enumerating the currently |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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107 |
active connections and subconnections </p> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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108 |
<li id="GUID-8E888149-A79D-5608-9875-9753CEE59EE9"><p>The current status of |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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109 |
all network connections e.g. active/suspended </p> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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|
110 |
<li id="GUID-B1125663-747F-5F8C-927F-94AB17482FE5"><p>The amount of data (in |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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|
111 |
bytes) transferred uplink and downlink by the network connection and subconnections </p> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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|
112 |
<li id="GUID-E00B23A4-E91B-54E7-9AE1-429E19C520AB"><p>The amount of time each |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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113 |
network connection has been active (in seconds) </p> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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114 |
<li id="GUID-7AC5AC0D-9147-52A5-A427-B5D798D9A119"><p>The current status of |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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115 |
the connection and subconnections with respect to data transfer, i.e. active/inactive </p> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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116 |
<li id="GUID-AD4C0A7A-E48E-513F-806A-40934415D42B"><p>The Quality of Service |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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117 |
profile associated with each Packet Data Protocol (GPRS/UMTS) context, e.g. |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
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118 |
low/medium/high </p> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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119 |
</ul> </li> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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120 |
</ul> </section> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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121 |
</conbody><related-links> |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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122 |
<link href="GUID-5CFC075C-8F53-5E1B-A111-C6F4567DFD1E.dita"><linktext>RConnection |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
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123 |
API Summary Reference</linktext></link> |
5
f345bda72bc4
Week 12 contribution of PDK documentation_content. See release notes for details. Fixes Bug 2054, Bug 1583, Bug 381, Bug 390, Bug 463, Bug 1897, Bug 344, Bug 1319, Bug 394, Bug 1520, Bug 1522, Bug 1892"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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124 |
</related-links></concept> |