add scripts and stuff necessary to automatically generate the diagram using graph-easy...

required writting a simple awk script to add the necessary border for MarkDeep..
haven't integrated the diagram generation into the file yet..

Makefile

@@ -0,0 +1,6 @@
+# https://github.com/ironcamel/Graph-Easy
+diag.txt: diag_inp.txt box.sh
+	graph-easy < $< | sh box.sh > $@
+
+diagtest:
+	ls box.sh diag_inp.txt Makefile | entr sh -c 'make diag.txt && cat diag.txt'

box.sh

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+#!/bin/sh
+fname=$(mktemp foobar.XXXXX)
+cat > "$fname"
+awk '
+maxline == 1 {
+	if (maxlength < length)
+		maxlength = length
+}
+
+function printtop () {
+	blank = ""
+	for (i = 0; i < maxlength + 4; i++)
+		blank = blank "*"
+	printf("%s\n", blank)
+}
+
+output == 1 && FNR == 1 {
+	printtop()
+	printf("* %*s *\n", maxlength, "")
+}
+
+output == 1 {
+	printf("* %s%*s *\n", $0, maxlength - length, "")
+}
+
+END {
+	printf("* %*s *\n", maxlength, "")
+	printtop()
+}
+' maxline=1 "$fname" maxline=0 output=1 "$fname"
+
+rm "$fname"

diag.txt

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+*********************************************************************************
+*                                                                               *
+*                                                +-------------+                *
+*                                                |  Internet   |                *
+*                                                +-------------+                *
+*                                                  |                            *
+*                                                  |                            *
+*                                                  |                            *
+* +----------------+                             +-------------+                *
+* |  Host machine  |-----------------------------| VLAN Switch |                *
+* +----------------+                             +-------------+                *
+*   |                                              |                            *
+*   |                                              |                            *
+*   |                                              |                            *
+* +----------------+     +-----------------+     +-------------+     +--------+ *
+* |    USB Hub     | --- | Power Controler | --- |  RockPro64  |     | 12V PS | *
+* +----------------+     +-----------------+     +-------------+     +--------+ *
+*   |                      |                       |                   |        *
+*   |                      +-----------------------+-------------------+        *
+*   |                                              |                            *
+* +----------------+                               |                            *
+* | Serial adapter |-------------------------------+                            *
+* +----------------+                                                            *
+*                                                                               *
+*********************************************************************************

diag_inp.txt

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+[ Internet ] { flow: north } -- [ VLAN Switch ]
+[ Host machine ] -- [ VLAN Switch ]
+[ Host machine ] { flow: south } -- [ USB Hub ]
+[ RockPro64 ] { flow: north } -- [ VLAN Switch ]
+[ USB Hub ] -- [ Power Controler ]
+[ USB Hub ] -- [ Serial adapter ]
+[ Serial adapter ] -- [ RockPro64 ]
+[ Power Controler ] -- [ 12V PS ]
+[ Power Controler ] { flow: east } -- [ RockPro64 ]