Outputting PGN 127505 - Fluid Level

[geoffschultz]

I am new to Signal-K and Node-Red, so please excuse me if this is obvious to more experienced users. I have a Victron Cerbo running Signal-K and Node-Red. I have ultrasonic fluid transducers that provide highly varying level readings. I want to smooth the data and send out a level of the data over the past 30 seconds. So here's what I've done:

Subscribe to tanks.freshWater.1.currentLevel (which outputs every 2.5 seconds)
Feed that into a smooth function which outputs every 12 results (every 30 seconds)
Feed the output of the smooth into a function that contains:

var level = msg.payload;
const pgn = {
"pgn": 127505,
"Instance": 102,
"Type": "Fresh Water",
"Level": Number(level),
"Capacity": 0.1
}
msg.payload = pgn;
return msg;

This msg.payload is the input for signalk-send-nmea2000. However, I don't see a tanks.freshWater.102 appear.

What am I doing wrong? I'm guessing that I have the wrong Type, but can't find where tank_type is defined.

Here's the definition of PGN 127505:

{"Fluid Level",
 127505,
 PACKET_COMPLETE,
 PACKET_SINGLE,
 {SIMPLE_FIELD(PK("Instance"), 4),
  LOOKUP_FIELD("Type", 4, TANK_TYPE),
  PERCENTAGE_I16_FIELD("Level"),
  VOLUME_UFIX32_DL_FIELD("Capacity"),
  RESERVED_FIELD(BYTES(1)),
  END_OF_FIELDS},
 .priority = 6,
 .url      = "https://web.archive.org/web/20060511065306/http://www.maretron.com/support/manuals/TLA100UM_1.2.pdf",
 .interval = 2500}`