<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentScriptType="application/ecmascript" contentStyleType="text/css" height="1442px" preserveAspectRatio="none" style="width:890px;height:1442px;background:#F0F0F0;" version="1.1" viewBox="0 0 890 1442" width="890px" zoomAndPan="magnify"><defs><filter height="300%" id="fr4ju0uxlqsyz" width="300%" x="-1" y="-1"><feGaussianBlur result="blurOut" stdDeviation="2.0"/><feColorMatrix in="blurOut" result="blurOut2" type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .4 0"/><feOffset dx="4.0" dy="4.0" in="blurOut2" result="blurOut3"/><feBlend in="SourceGraphic" in2="blurOut3" mode="normal"/></filter></defs><g><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 5.0,5.0;" x1="91" x2="91" y1="38.2969" y2="1401.7422"/><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 5.0,5.0;" x1="429.5" x2="429.5" y1="38.2969" y2="1401.7422"/><line style="stroke: #A80036; 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stroke-width: 2.0;" width="346" x="267.75" y="1115.6797"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="332" x="273.75" y="1131.7466">Connection manager in Messages only mode</text><polygon fill="#A80036" points="102.5,1165.9453,92.5,1169.9453,102.5,1173.9453,98.5,1169.9453" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="96.5" x2="428.5" y1="1169.9453" y2="1169.9453"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="196" x="108.5" y="1164.8794">service timer tick (60 seconds)</text><line style="stroke: #A80036; stroke-width: 1.0;" x1="91.5" x2="133.5" y1="1199.0781" y2="1199.0781"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="133.5" x2="133.5" y1="1199.0781" y2="1212.0781"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="92.5" x2="133.5" y1="1212.0781" y2="1212.0781"/><polygon fill="#A80036" points="102.5,1208.0781,92.5,1212.0781,102.5,1216.0781,98.5,1212.0781" style="stroke: #A80036; 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stroke-width: 1.0;" x1="91.5" x2="423.5" y1="1354.6094" y2="1354.6094"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="164" x="98.5" y="1349.5435">disconnectFromNetwork()</text><polygon fill="#A80036" points="417.5,1379.7422,427.5,1383.7422,417.5,1387.7422,421.5,1383.7422" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="91.5" x2="423.5" y1="1383.7422" y2="1383.7422"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="148" x="98.5" y="1378.6763">clearNetworkIndicator()</text><!--MD5=[7b7194bf9c1ccad1d1fe508351e71d48]
@startuml
skinparam BackgroundColor F0F0F0

participant "Connection manager " as manager
participant "Service cellular" as cellular
participant "Phone mode observer " as mode

== Phone is connected to the GSM network==

mode ->cellular : Phone mode change to Connected/ Do not Disturb
cellular -> manager : onPhoneMode()
manager -> cellular :isConnectedToTheNetwork() AT+CFUN?
cellular -> manager : +CFUN: 1

mode ->cellular : Phone mode change to Offline / Message only
cellular -> manager : onPhoneMode()
manager -> cellular :isConnectedToTheNetwork() AT+CFUN?
cellular -> manager : +CFUN: 1
manager -> cellular :hangUpOngoingCall()
manager -> cellular :disconnectFromNetwork() AT+CFUN=4
manager -> cellular :clearNetworkIndicator()
manager->manager : handle switch to selected oflline mode

== Phone is not connected to the GSM network==

mode ->cellular : Phone mode change to CConnected/ Do not Disturb
cellular -> manager : onPhoneMode()
manager -> cellular :isConnectedToTheNetwork() AT+CFUN?
cellular -> manager : +CFUN: 4
manager -> cellular :connectToTheNetwork() AT+CFUN=1

mode ->cellular : Phone mode change to Offline / Message only
cellular -> manager : onPhoneMode()
manager -> cellular :isConnectedToTheNetwork() AT+CFUN?
cellular -> manager : +CFUN: 4
manager->manager : handle switch to selected oflline mode

==handle switch to selected oflline mode==

==handleModeChangeToOfflineMode()==
manager -> cellular : isConnectionTimerActive()
cellular -> manager : timer is active
manager -> cellular : stopConnectionTimer()

==handleModeChangeToOfflineMode()==
manager -> cellular : isConnectionTimerActive()
cellular -> manager : timer is not active
manager -> cellular : startonnectionTimer()

==Connection manager in Messages only mode==
cellular -> manager : service timer tick (60 seconds)
manager -> manager : offline period not expired, online period not expired

manager -> manager : offline period expired onTimTick()
manager -> cellular : connectToNetwork()

manager -> manager : online period expired onTimTick()
manager -> cellular : disconnectFromNetwork()
manager -> cellular :clearNetworkIndicator()
@enduml

PlantUML version 1.2020.02(Sun Mar 01 05:22:07 EST 2020)
(GPL source distribution)
Java Runtime: OpenJDK Runtime Environment
JVM: OpenJDK 64-Bit Server VM
Java Version: 11.0.12+7-post-Debian-2
Operating System: Linux
Default Encoding: UTF-8
Language: en
Country: US
--></g></svg>