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fix: Detect unpaired Bluetooth devices during connection

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The application now properly detects when a Brother PP1 machine is not paired with the operating system. Previously, the connection would appear successful but commands would fail silently.

Changes:
- Enhanced sendCommand() to check for empty or invalid responses during initial connection
- Updated connect() to validate the connection with a test command (getMachineState)
- Properly disconnect and clean up when pairing is not established
- Throw BluetoothPairingError with helpful instructions for the user

When the machine is not paired, users now see a clear error message instructing them to:
1. Long-press the Bluetooth button on the machine
2. Pair via the operating system's Bluetooth settings
3. Try connecting again

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This commit is contained in:
Jan-Henrik 2025-12-15 13:45:09 +01:00
parent 5f46f67cb4
commit caf800b40b
1 changed files with 27 additions and 4 deletions
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31
src/services/BrotherPP1Service.ts
View file

@ -131,12 +131,18 @@ export class BrotherPP1Service {
console.log("Connected to Brother PP1 machine");
console.log("Send dummy command");
// Validate connection by sending a test command
// If the device is not paired, it won't respond properly
console.log("Validating connection with test command...");
try {
await this.getMachineInfo();
console.log("Dummy command success");
await this.getMachineState();
console.log("Connection validation successful - device is properly paired");
} catch (e) {
console.log(e);
console.log("Connection validation failed:", e);
// Disconnect to clean up
if (this.server) {
this.server.disconnect();
}
throw e;
}
} finally {
@ -280,6 +286,23 @@ export class BrotherPP1Service {
.map((b) => b.toString(16).padStart(2, "0"))
.join(" ");
// Detect pairing issues during initial connection - empty or invalid response
if (this.isInitialConnection) {
if (response.length === 0) {
console.log('[BrotherPP1] Empty response received - device likely not paired');
throw new BluetoothPairingError(
'Device not paired. To pair: long-press the Bluetooth button on the machine, then pair it using your operating system\'s Bluetooth settings. After pairing, try connecting again.'
);
}
// Check for invalid response (less than 3 bytes means no proper command response)
if (response.length < 3) {
console.log('[BrotherPP1] Invalid response length:', response.length);
throw new BluetoothPairingError(
'Device not paired. To pair: long-press the Bluetooth button on the machine, then pair it using your operating system\'s Bluetooth settings. After pairing, try connecting again.'
);
}
}
// Parse response
let parsed = "";
if (response.length >= 3) {