add sending udp message on behalf of an non-supporting server

t.py

@@ -46,3 +46,31 @@ def crv(*args, **kwds):
     global result
     result = db.curves(*args, **kwds)
     prt()
+
+
+def sry():
+    global result
+    res = db.query(-DAY * 365, interval=DAY, _field='float',
+                   device=None, stream=None, _measurement=None)
+    result = {}  # dict (device, stream) of list of [start, end, set of params]
+    for key, table in res.items():
+        assert table.key_names == ('device', 'stream', '_measurement')
+        device, stream, param = key
+        for row in table:
+            start = row[0] - 3600
+            result.setdefault((start, device, stream), set()).add(param)
+    prev_data = {}
+    summary = []
+    for (start, device, stream), pset in sorted(result.items()):
+        prev = prev_data.get((device, stream))
+        if prev is None or start > prev[1]:
+            if prev:
+                print('PREV', device, stream, start - prev[1])
+            prev_data[device, stream] = prev = [start, start + 3600, pset]
+            summary.append([start, device, stream, prev])
+        else:
+            prev[1] = start + 3600
+            prev[2].update(pset)
+    for start, device, stream, (_, end, pset) in sorted(summary):
+        st = time.strftime('%Y-%m-%d %H:%M', time.localtime(start))
+        print(st, (end - start) / 3600., device, stream, len(pset))