add some helper tools for converting candumps

tools/getPgnType.py

@@ -0,0 +1,29 @@
+#! /usr/bin/env python3
+import sys
+import json
+
+def err(txt):
+    print(txt,file=sys.stderr)
+    sys.exit(1)
+
+HDR='''
+PGNM_Fast=0
+PGNM_Single=1
+PGNM_ISO=2
+PGN_MODES={
+'''
+FOOTER='''
+    }
+'''
+with open(sys.argv[1],"r") as ih:
+    data=json.load(ih)
+    pgns=data.get('PGNs')
+    if pgns is None:
+        err("no pgns")
+    print(HDR)
+    for p in pgns:
+        t=p['Type']
+        pgn=p['PGN']
+        if t and pgn:
+            print(f"    {pgn}: PGNM_{t},")
+    print(FOOTER)