@coremarine/thelmabiotel-tblive-nodered 3.0.0

Node-RED component to read Thelma Biotel TB Live receiver output as CMA

npm install @coremarine/thelmabiotel-tblive-nodered

@coremarine/thelmabiotel-tblive-nodered

Node-RED node for the Thelma Biotel TB Live acoustic receiver (hydrophone). It turns the receiver's serial output into CMA, the same JSON shape every CoreMarine device parser emits.

Wrapper of @coremarine/thelmabiotel-tblive. Node >= 22, Node-RED >= 4.

Install

From the Node-RED palette manager, or:

npm install @coremarine/thelmabiotel-tblive-nodered

The node appears in the CoreMarine palette category as TB Live parser.

Configuration

The firmware is the protocol version: 1.0.1 detections carry 9 fields and logs 8, while 1.0.2 carries 8 and 7. Left on learn, the parser works it out from the stream (an FV= response, or whether the receiver entered command mode with LIVECM or TBRC) and reports unknown until something proves it. Pin it when your deployment knows better than the wire does.

msg API

Send payload to parse. Every other key is optional; a key you do not send is absent from the output too, and on a bad request the corresponding output key holds an error string.

Full details, tables and warnings are in the node's help panel inside Node-RED.

Diagnostics

ids and definition let a flow ask the running node what it expects — field names, types, units, descriptions, which of the device's two APIs a sentence belongs to, and prose saying how it is recognised on the wire. Omit protocol to get every firmware version, which is how you see what the firmware changes.

That matters because these receivers sit on remote installations with restricted internet access for years: asking the deployed node settles a question that would otherwise need the datasheets.

Fake sentences

fake generates a valid sample sentence. protocol is required (the output genuinely differs by firmware), it is deterministic, and with no options it reproduces the datasheets' own examples:

msg.fake = { id: 'emitter', protocol: '1.0.1' }
// -> '$1000042,1589557202,615,S64K,1285,0,24,69,11\r'

Two things a flow must handle

A field can be null — present but empty. The emitter data field is empty for ID-only transmit protocols (R256, R04K, R64K, R01M, OPi). null means "no measurement" and must never be read as zero. Version 1.x reported 0 there, which made a missing reading indistinguishable from a perfectly vertical mooring line.

Sentences can carry errors. Nothing the parser receives is dropped silently any more: malformed input, line noise and interference-wrecked sentences all arrive, flagged. Check errors and id === 'unknown' before trusting a reading. The shipped example flow demonstrates this with a splitter routing clean and flagged sentences to separate debug nodes.

The emitter data field is not decoded. Those 16 bits carry whatever the emitter's firmware encodes — an inclinometer, or tilt plus depth — which is not part of the TB Live protocol, so decoding it is your flow's job.

Examples

Import examples/thelmabiotel-tblive-examples.json from the Node-RED menu → Import → Examples, or open it directly:

pnpm run thelmabiotel-tblive:nodered:examples

Nine groups, every payload taken from the datasheets: listening data, the empty-data case, failed and garbage sentences (line noise, half-duplex interference, bad field counts), memory and split sentences, firmware learning versus pinning, command-mode responses, diagnostics, and fake sentences. It uses only built-in node types, so it imports cleanly with no extra contrib nodes.

Development

pnpm run thelmabiotel-tblive:nodered:build    # tsup -> CJS + copy html/icons
pnpm run thelmabiotel-tblive:nodered:test     # node:test — unit + real headless node-red
pnpm run thelmabiotel-tblive:nodered:dev      # local Node-RED on a scratch flow

Upgrading from 1.x

The output is now CMA rather than the old ParsedSentence. The node type is unchanged (cma-thelmabiotel-tblive), so existing flows keep their node — but the data changed:

• msg.firmwares (a bare array, emitted on every message) is gone. Use msg.firmware with { command: 'get' }, which reports the current firmware and the available ones.
• msg.memory was a bare boolean in and out; it is now { command, payload } in and a { memory, characters } report out.
• No top-level mode or firmware on the output: mode moved to metadata.mode, and the firmware is now protocol.version.
• protocol is new and required on every CMA — { name: 'TBLive', version }.
• Serial numbers are strings, so the receiver's inconsistent zero-padding survives ('001129' used to become 1129). Match on the last digits with a string comparison.
• Values can be null, and sentences that used to vanish now arrive with errors.
• metadata.angle is gone — the inclination decode was removed from the library, so a flow that relied on it must decode the data field itself.
• Node >= 22 (was >= 18) and Node-RED >= 4 (was >= 3).

License

MIT