diff --git a/doc/manual/docs/picts/le_security_flow_control.txt b/doc/manual/docs/picts/le_security_flow_control.txt
new file mode 100644
index 000000000..4e962d7c3
--- /dev/null
+++ b/doc/manual/docs/picts/le_security_flow_control.txt
@@ -0,0 +1,154 @@
+@startuml
+start
+: A connects to B;
+: App triggers GATT Client request on A;
+if (called gatt_client_set_required_security_level) then (yes)
+
+  if (LTK available) then (yes)
+     : start encryption;
+  else (no)
+     : start pairing;
+  endif
+  if (paired/re-encrypted) then (yes)
+     : GATT Client request sent;
+     #23DB2B : App receives GATT Response;
+     stop
+  else (no)
+     #FD5B41 : App receives a GATT Client error;
+     stop
+  endif
+endif
+
+if (ENABLE_LE_PROACTIVE_AUTHENTICATION and LTK available) then (yes)
+  : starts encryption;
+  if (re-encrypted) then (yes)
+     : GATT Client request sent;
+     #23DB2B : App receives GATT Response;
+     stop
+  else (no) 
+     #FD5B41 : App receives a GATT Client error;
+     stop
+     note left
+        App can delete bonding 
+        information and repeat 
+        the GATT Client request
+     end note
+  endif
+endif
+
+: GATT Client request is sent to GATT Server;
+if (GATT Server returns an 'insufficient x' error) then (yes)
+  if (ENABLE_GATT_CLIENT_PAIRING) then (yes)
+    if (LTK available) then (yes)
+      : start encryption;
+    else (no)
+      : start pairing;
+    endif
+    if (paired/re-encrypted) then (yes)
+      : GATT Client request sent;
+      #23DB2B : App receives GATT Response;
+      stop
+    else (no)
+      #FD5B41 : App receives a GATT Client error;
+      stop
+    endif
+  else (no)
+    #FD5B41 : App receives a GATT Client error;
+    stop
+  endif
+endif
+#23DB2B : App receives GATT Response;
+stop
+@enduml
+
+@startuml
+title Mandatory Authentication
+start
+: App calls gatt_client_set_required_security_level (level > 0);
+: A connects to B;
+: App triggers GATT Client request on A;
+
+if (LTK available) then (yes)
+   : start encryption;
+else (no)
+   : start pairing;
+endif
+if (paired/re-encrypted) then (yes)
+   : GATT Client request sent;
+   #23DB2B : App receives GATT Response;
+   stop
+else (no)
+   #FD5B41 : App receives a GATT Client error;
+   stop
+endif
+@enduml
+
+
+@startuml
+title Proactive Authentication with LTK
+start
+: A connects to B;
+: App triggers GATT Client request on A;
+if (role) then (Central)
+: start encryption;
+else (Peripheral)
+: send security request;
+endif
+if (re-encrypted) then (yes)
+   : GATT Client request sent;
+   #23DB2B : App receives GATT Response;
+   stop
+else (no) 
+   #FD5B41 : App receives a GATT Client error;
+   stop
+   note right
+      App can delete bonding 
+      information and repeat 
+      the GATT Client request
+   end note
+endif
+@enduml
+
+@startuml
+title Reactive Authentication
+start
+: A connects to B;
+: App triggers GATT Client request on A;
+: GATT Client request sent;
+
+if (GATT Server returns an 'insufficient x' error) then (yes)
+  if (ENABLE_GATT_CLIENT_PAIRING) then (yes)
+    if (LTK available) then (yes)
+      : start encryption;
+      if (re-encrypted) then (yes)
+        : GATT Client request sent;
+        #23DB2B : App receives GATT Response;
+        stop
+      else (no)
+        : delete bonding information;
+      endif
+      -> no;
+   endif
+    -> no;
+    : start pairing;
+      if (paired) then (yes)
+        : GATT Client request sent;
+        #23DB2B : App receives GATT Response;
+        stop
+      else (no)
+        #FD5B41 : App receives a GATT Client error;
+        stop
+      endif
+  else (no)
+    #FD5B41 : App receives a GATT Client error;
+    stop
+    note left
+      App can trigger pairing and 
+      repeat the GATT Client request
+    end note
+  endif
+else (no)
+  #23DB2B : App receives GATT Response;
+  stop
+endif
+@enduml
\ No newline at end of file
diff --git a/doc/manual/docs/picts/le_security_flow_control_mandatory_authentication.svg b/doc/manual/docs/picts/le_security_flow_control_mandatory_authentication.svg
new file mode 100644
index 000000000..92df2561a
--- /dev/null
+++ b/doc/manual/docs/picts/le_security_flow_control_mandatory_authentication.svg
@@ -0,0 +1,31 @@
+<?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="531px" preserveAspectRatio="none" style="width:475px;height:531px;" version="1.1" viewBox="0 0 475 531" width="475px" zoomAndPan="magnify"><defs><filter height="300%" id="fd61dpuvf2moq" 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><text fill="#000000" font-family="sans-serif" font-size="18" lengthAdjust="spacingAndGlyphs" textLength="243" x="115" y="26.708">Mandatory Authentication</text><ellipse cx="229.75" cy="40.9531" fill="#000000" filter="url(#fd61dpuvf2moq)" rx="10" ry="10" style="stroke: none; stroke-width: 1.0;"/><rect fill="#FEFECE" filter="url(#fd61dpuvf2moq)" height="33.9688" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="385" x="37.25" y="70.9531"/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="361" x="51.25" y="92.0918">App calls gatt_client_set_required_security_level (level &gt; 0)</text><rect fill="#FEFECE" filter="url(#fd61dpuvf2moq)" height="33.9688" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="119" x="170.25" y="124.9219"/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="95" x="184.25" y="146.0605">A connects to B</text><rect fill="#FEFECE" filter="url(#fd61dpuvf2moq)" height="33.9688" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="254" x="102.75" y="178.8906"/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="230" x="116.75" y="200.0293">App triggers GATT Client request on A</text><polygon fill="#FEFECE" filter="url(#fd61dpuvf2moq)" points="191.75,232.8594,267.75,232.8594,279.75,244.8594,267.75,256.8594,191.75,256.8594,179.75,244.8594,191.75,232.8594" style="stroke: #A80036; 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+@startuml
+title Mandatory Authentication
+start
+: App calls gatt_client_set_required_security_level (level > 0);
+: A connects to B;
+: App triggers GATT Client request on A;
+
+if (LTK available) then (yes)
+   : start encryption;
+else (no)
+   : start pairing;
+endif
+if (paired/re-encrypted) then (yes)
+   : GATT Client request sent;
+   #23DB2B : App receives GATT Response;
+   stop
+else (no)
+   #FD5B41 : App receives a GATT Client error;
+   stop
+endif
+@enduml
+
+PlantUML version 1.2020.20beta13(Unknown compile time)
+(GPL source distribution)
+Java Runtime: Java(TM) SE Runtime Environment
+JVM: Java HotSpot(TM) 64-Bit Server VM
+Default Encoding: UTF-8
+Language: en
+Country: US
+--></g></svg>
\ No newline at end of file
diff --git a/doc/manual/docs/picts/le_security_flow_control_proactive_authentication.svg b/doc/manual/docs/picts/le_security_flow_control_proactive_authentication.svg
new file mode 100644
index 000000000..288ce405c
--- /dev/null
+++ b/doc/manual/docs/picts/le_security_flow_control_proactive_authentication.svg
@@ -0,0 +1,34 @@
+<?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="492px" preserveAspectRatio="none" style="width:565px;height:492px;" version="1.1" viewBox="0 0 565 492" width="565px" zoomAndPan="magnify"><defs><filter height="300%" id="fwalz9fe9wo82" 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><text fill="#000000" font-family="sans-serif" font-size="18" lengthAdjust="spacingAndGlyphs" textLength="315" x="124.25" y="26.708">Proactive Authentication with LTK</text><ellipse cx="229.75" cy="40.9531" fill="#000000" filter="url(#fwalz9fe9wo82)" rx="10" ry="10" style="stroke: none; stroke-width: 1.0;"/><rect fill="#FEFECE" filter="url(#fwalz9fe9wo82)" height="33.9688" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="119" x="170.25" y="70.9531"/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="95" x="184.25" y="92.0918">A connects to B</text><rect fill="#FEFECE" filter="url(#fwalz9fe9wo82)" height="33.9688" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="254" x="102.75" y="124.9219"/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="230" x="116.75" y="146.0605">App triggers GATT Client request on A</text><polygon fill="#FEFECE" filter="url(#fwalz9fe9wo82)" points="217.75,178.8906,241.75,178.8906,253.75,190.8906,241.75,202.8906,217.75,202.8906,205.75,190.8906,217.75,178.8906" style="stroke: #A80036; stroke-width: 1.5;"/><text fill="#000000" font-family="sans-serif" font-size="11" lengthAdjust="spacingAndGlyphs" textLength="22" x="218.75" y="194.6987">role</text><text fill="#000000" font-family="sans-serif" font-size="11" lengthAdjust="spacingAndGlyphs" textLength="41" x="164.75" y="188.2964">Central</text><text fill="#000000" font-family="sans-serif" font-size="11" lengthAdjust="spacingAndGlyphs" textLength="57" x="253.75" y="188.2964">Peripheral</text><rect fill="#FEFECE" filter="url(#fwalz9fe9wo82)" height="33.9688" rx="12.5" ry="12.5" style="stroke: #A80036; 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+@startuml
+title Proactive Authentication with LTK
+start
+: A connects to B;
+: App triggers GATT Client request on A;
+if (role) then (Central)
+: start encryption;
+else (Peripheral)
+: send security request;
+endif
+if (re-encrypted) then (yes)
+   : GATT Client request sent;
+   #23DB2B : App receives GATT Response;
+   stop
+else (no) 
+   #FD5B41 : App receives a GATT Client error;
+   stop
+   note right
+      App can delete bonding 
+      information and repeat 
+      the GATT Client request
+   end note
+endif
+@enduml
+
+PlantUML version 1.2020.20beta13(Unknown compile time)
+(GPL source distribution)
+Java Runtime: Java(TM) SE Runtime Environment
+JVM: Java HotSpot(TM) 64-Bit Server VM
+Default Encoding: UTF-8
+Language: en
+Country: US
+--></g></svg>
\ No newline at end of file
diff --git a/doc/manual/docs/picts/le_security_flow_control_reactive_authentication.svg b/doc/manual/docs/picts/le_security_flow_control_reactive_authentication.svg
new file mode 100644
index 000000000..573b479cc
--- /dev/null
+++ b/doc/manual/docs/picts/le_security_flow_control_reactive_authentication.svg
@@ -0,0 +1,51 @@
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+@startuml
+title Reactive Authentication
+start
+: A connects to B;
+: App triggers GATT Client request on A;
+: GATT Client request sent;
+
+if (GATT Server returns an 'insufficient x' error) then (yes)
+  if (ENABLE_GATT_CLIENT_PAIRING) then (yes)
+    if (LTK available) then (yes)
+      : start encryption;
+      if (re-encrypted) then (yes)
+        : GATT Client request sent;
+        #23DB2B : App receives GATT Response;
+        stop
+      else (no)
+        : delete bonding information;
+      endif
+   endif
+    : start pairing;
+      if (paired) then (yes)
+        : GATT Client request sent;
+        #23DB2B : App receives GATT Response;
+        stop
+      else (no)
+        #FD5B41 : App receives a GATT Client error;
+        stop
+      endif
+  else (no)
+    #FD5B41 : App receives a GATT Client error;
+    stop
+    note left
+      App can trigger pairing and 
+      repeat the GATT Client request
+    end note
+  endif
+else (no)
+  #23DB2B : App receives GATT Response;
+  stop
+endif
+@enduml
+
+PlantUML version 1.2020.20beta13(Unknown compile time)
+(GPL source distribution)
+Java Runtime: Java(TM) SE Runtime Environment
+JVM: Java HotSpot(TM) 64-Bit Server VM
+Default Encoding: UTF-8
+Language: en
+Country: US
+--></g></svg>
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