USB Serial Send (`usbSerialSend`)

Category: Device Lab

Intended behavior

Writes a line of text over USB serial. Simulated on the canvas; the backend writes to the real port when a Device Lab monitor session has it open; on-device it becomes Serial.println().

Inputs

ID	Label	Type	Unwired default
`inTrigger`	Send	trigger	undefined
`text`	Text	string	""

Outputs

ID	Label	Type	Default
`outTrigger`	Sent	trigger	undefined
`sent`	Sent OK	boolean	undefined

Configuration defaults

{
  "port": "",
  "baud": 115200,
  "newline": true,
  "sent": false
}

Observed frontend behavior

This calls the production passive computation with the declared input/config defaults. Cached state, trigger execution and project wiring are separate.

{
  "kind": "passive-default-probe",
  "outputs": {
    "sent": false
  }
}

Observed backend behavior

Offline production passive computation with the same declared defaults; no device or model service is invoked.

{
  "kind": "passive-default-probe",
  "outputs": {
    "sent": false
  }
}

Current frontend implementation

Extracted production branches; helper calls and project execution context are defined in the referenced modules.

src/lib/device-node-compute.ts:67

usbSerialSend: (_inputs, config) => ({ sent: Boolean(config.sent) })

src/lib/device-node-compute.ts:99

usbSerialSend: (inputs, config) => ({
    nextTriggerPort: "outTrigger",
    // The canvas simulation always "sends"; the backend replaces this with
    // a real write when the configured port has an open monitor session.
    updatedConfig: { ...config, sent: true, lastText: String(inputs.text ?? "") },
  })

Implementation references

Verification limits

Default passive probe is an observation, not proof of all configurations, trigger behavior, or correctness. See ../NODE_RUNTIME_AUDIT.md and ../AUDIT_VALIDATION.md for test evidence.
Trigger inputs schedule actions; passive evaluation alone does not execute those actions. Wire a trigger source and test the full chain.
Software simulation does not establish physical device, firmware, camera or transport correctness.

Source fingerprint: 7e9d192bd3a559a7c50253919867601ef02c311d61e859f7afb4cadcfa508430. Rebuild with npm run docs:index.

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