diff --git a/app/tests/timestamp_old.svg b/app/tests/timestamp_old.svg
new file mode 100644
index 0000000..739a420
--- /dev/null
+++ b/app/tests/timestamp_old.svg
@@ -0,0 +1,2 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="624.75" height="952">
+<defs><marker id="arrow-filled" refX="6" refY="3" markerWidth="6" markerHeight="6" orient="auto"><path d="M0,0 6,3 0,6z" style="stroke: none; fill: black;"></path></marker><marker id="arrow-open" refX="6" refY="3" markerWidth="6" markerHeight="6" orient="auto"><path d="M0,0 6,3 0,6" style="stroke-width: 1; fill: none; stroke: black;"></path></marker></defs><rect width="88" height="38" style="stroke-width: 1; fill: none; stroke: black;" x="10" y="20"></rect><g><text fill="black" font-family="Helvetica,sans-Serif" x="54" y="39" style="text-anchor: middle; alignment-baseline: central;">Inverter</text></g><rect width="88" height="38" style="stroke-width: 1; fill: none; stroke: black;" x="10" y="894"></rect><g><text fill="black" font-family="Helvetica,sans-Serif" x="54" y="913" style="text-anchor: middle; alignment-baseline: central;">Inverter</text></g><path d="M54,58 v836" style="stroke-width: 1; fill: none; stroke: black;"></path><rect width="62.5" height="38" style="stroke-width: 1; fill: none; stroke: black;" x="195.75" y="20"></rect><g><text fill="black" font-family="Helvetica,sans-Serif" x="227" y="39" style="text-anchor: middle; alignment-baseline: central;">Proxy</text></g><rect width="62.5" height="38" style="stroke-width: 1; fill: none; stroke: black;" x="195.75" y="894"></rect><g><text fill="black" font-family="Helvetica,sans-Serif" x="227" y="913" style="text-anchor: middle; alignment-baseline: central;">Proxy</text></g><path d="M227,58 v836" style="stroke-width: 1; fill: none; stroke: black;"></path><rect width="62.5" height="38" style="stroke-width: 1; fill: none; stroke: black;" x="398.75" y="20"></rect><g><text fill="black" font-family="Helvetica,sans-Serif" x="430" y="39" style="text-anchor: middle; alignment-baseline: central;">Cloud</text></g><rect width="62.5" height="38" style="stroke-width: 1; fill: none; stroke: black;" x="398.75" y="894"></rect><g><text fill="black" font-family="Helvetica,sans-Serif" x="430" y="913" style="text-anchor: middle; alignment-baseline: central;">Cloud</text></g><path d="M430,58 v836" style="stroke-width: 1; fill: none; stroke: black;"></path><rect width="113.5" height="38" style="stroke-width: 1; fill: none; stroke: black;" x="481.25" y="20"></rect><g><text fill="black" font-family="Helvetica,sans-Serif" x="538" y="39" style="text-anchor: middle; alignment-baseline: central;">MQTT-Broker</text></g><rect width="113.5" height="38" style="stroke-width: 1; fill: none; stroke: black;" x="481.25" y="894"></rect><g><text fill="black" font-family="Helvetica,sans-Serif" x="538" y="913" style="text-anchor: middle; alignment-baseline: central;">MQTT-Broker</text></g><path d="M538,58 v836" style="stroke-width: 1; fill: none; stroke: black;"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="140.5" y="83" style="text-anchor: middle; alignment-baseline: central;">ContactInd</text></g><path d="M54,96 h173" style="stroke-width: 1; fill: none; stroke: black;" marker-end="url(#arrow-filled)"></path><path d="M403,116 L403,123 L410,123 L403,116 L247,116 L247,162 L410,162 L410,123 Z" style="stroke-width: 1; fill: cornsilk; stroke: black;"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="328.5" y="130" style="text-anchor: middle; alignment-baseline: central;">store Contact Info</text><text fill="black" font-family="Helvetica,sans-Serif" x="328.5" y="148" style="text-anchor: middle; alignment-baseline: central;">in proxy</text></g><g><text fill="black" font-family="Helvetica,sans-Serif" x="140.5" y="187" style="text-anchor: middle; alignment-baseline: central;">ContactRsp (Ok)</text></g><path d="M227,200 h-173" style="stroke-width: 1; fill: none; stroke: black;" stroke-dasharray="7,4" marker-end="url(#arrow-filled)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="140.5" y="225" style="text-anchor: middle; alignment-baseline: central;">getTimeReq</text></g><path d="M54,238 h173" style="stroke-width: 1; fill: none; stroke: black;" marker-end="url(#arrow-filled)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="328.5" y="263" style="text-anchor: middle; alignment-baseline: central;">ContactInd</text></g><path d="M227,276 h203" style="stroke-width: 1; fill: none; stroke: black;" marker-end="url(#arrow-filled)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="328.5" y="301" style="text-anchor: middle; alignment-baseline: central;">ContactRsp (Ok)</text></g><path d="M430,314 h-203" style="stroke-width: 1; fill: none; stroke: black;" stroke-dasharray="7,4" marker-end="url(#arrow-filled)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="328.5" y="339" style="text-anchor: middle; alignment-baseline: central;">getTimeReq</text></g><path d="M227,352 h203" style="stroke-width: 1; fill: none; stroke: black;" marker-end="url(#arrow-filled)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="328.5" y="377" style="text-anchor: middle; alignment-baseline: central;">TimeRsp (time)</text></g><path d="M430,390 h-203" style="stroke-width: 1; fill: none; stroke: black;" stroke-dasharray="7,4" marker-end="url(#arrow-filled)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="140.5" y="415" style="text-anchor: middle; alignment-baseline: central;">TimeRsp (time)</text></g><path d="M227,428 h-173" style="stroke-width: 1; fill: none; stroke: black;" stroke-dasharray="7,4" marker-end="url(#arrow-filled)"></path><path d="M179,448 L179,455 L186,455 L179,448 L74,448 L74,494 L186,494 L186,455 Z" style="stroke-width: 1; fill: cornsilk; stroke: black;"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="130" y="462" style="text-anchor: middle; alignment-baseline: central;">set clock in</text><text fill="black" font-family="Helvetica,sans-Serif" x="130" y="480" style="text-anchor: middle; alignment-baseline: central;">inverter</text></g><g><text fill="black" font-family="Helvetica,sans-Serif" x="140.5" y="519" style="text-anchor: middle; alignment-baseline: central;">DataInd (ts:=time)</text></g><path d="M54,532 h173" style="stroke-width: 1; fill: none; stroke: black;" marker-end="url(#arrow-filled)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="140.5" y="557" style="text-anchor: middle; alignment-baseline: central;">DataRsp</text></g><path d="M227,570 h-173" style="stroke-width: 1; fill: none; stroke: black;" marker-end="url(#arrow-filled)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="328.5" y="595" style="text-anchor: middle; alignment-baseline: central;">DataInd (ts)</text></g><path d="M227,608 h203" style="stroke-width: 1; fill: none; stroke: black;" marker-end="url(#arrow-open)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="382.5" y="633" style="text-anchor: middle; alignment-baseline: central;">DataInd</text></g><path d="M227,646 h311" style="stroke-width: 1; fill: none; stroke: black;" marker-end="url(#arrow-open)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="328.5" y="671" style="text-anchor: middle; alignment-baseline: central;">DataRsp</text></g><path d="M430,684 h-203" style="stroke-width: 1; fill: none; stroke: black;" marker-end="url(#arrow-open)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="140.5" y="709" style="text-anchor: middle; alignment-baseline: central;">DataInd (ts:=time)</text></g><path d="M54,722 h173" style="stroke-width: 1; fill: none; stroke: black;" marker-end="url(#arrow-filled)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="140.5" y="747" style="text-anchor: middle; alignment-baseline: central;">DataRsp</text></g><path d="M227,760 h-173" style="stroke-width: 1; fill: none; stroke: black;" marker-end="url(#arrow-filled)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="328.5" y="785" style="text-anchor: middle; alignment-baseline: central;">DataInd (ts)</text></g><path d="M227,798 h203" style="stroke-width: 1; fill: none; stroke: black;" marker-end="url(#arrow-open)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="382.5" y="823" style="text-anchor: middle; alignment-baseline: central;">DataInd</text></g><path d="M227,836 h311" style="stroke-width: 1; fill: none; stroke: black;" marker-end="url(#arrow-open)"></path><g><text fill="black" font-family="Helvetica,sans-Serif" x="328.5" y="861" style="text-anchor: middle; alignment-baseline: central;">DataRsp</text></g><path d="M430,874 h-203" style="stroke-width: 1; fill: none; stroke: black;" marker-end="url(#arrow-open)"></path></svg>
\ No newline at end of file
diff --git a/app/tests/timestamp_old.yuml b/app/tests/timestamp_old.yuml
new file mode 100644
index 0000000..8f2e99c
--- /dev/null
+++ b/app/tests/timestamp_old.yuml
@@ -0,0 +1,26 @@
+// {type:sequence}
+// {generate:true}
+
+[Inverter]ContactInd>[Proxy] 
+[Proxy]-[note: store Contact Info in proxy{bg:cornsilk}]
+[Proxy]ContactRsp (Ok).>[Inverter]
+
+[Inverter]getTimeReq>[Proxy]
+[Proxy]ContactInd>[Cloud]
+[Cloud]ContactRsp (Ok).>[Proxy]
+[Proxy]getTimeReq>[Cloud]
+[Cloud]TimeRsp (time).>[Proxy]
+[Proxy]TimeRsp (time).>[Inverter]
+[Inverter]-[note: set clock in inverter{bg:cornsilk}]
+
+[Inverter]DataInd (ts:=time)>[Proxy] 
+[Proxy]DataRsp>[Inverter] 
+[Proxy]DataInd (ts)>>[Cloud] 
+[Proxy]DataInd>>[MQTT-Broker] 
+[Cloud]DataRsp>>[Proxy]
+
+[Inverter]DataInd (ts:=time)>[Proxy] 
+[Proxy]DataRsp>[Inverter] 
+[Proxy]DataInd (ts)>>[Cloud] 
+[Proxy]DataInd>>[MQTT-Broker] 
+[Cloud]DataRsp>>[Proxy]