get map stream -> instrument from servicemanager for feeder

seinflux.py

@@ -35,6 +35,7 @@ class SEHistory(InfluxDBWrapper):
         parser.optionxform = str
         parser.read([Path('~/.config/sehistory').expanduser()])
         section = parser[dbname] if dbname else parser[parser.sections()[0]]
+        self.instrument_by_stream = {}
         super().__init__(*(section[k] for k in ('uri', 'token', 'org', 'bucket')), access=access)
 
     def curves(self, start=None, stop=None, measurement=('*.value', '*.target'), field='float',
@@ -407,4 +408,6 @@ class SEHistory(InfluxDBWrapper):
         self.flush()
 
     def add_stream(self, value, tags, key, ts):
+        if value == '':  # unknown instrument
+            value = self.instrument or self.instrument_by_stream.get(key, '0')
         self.set_instrument(key, value, ts, **tags)