Function toNumber

web/scripts/ragnar_modern.js:2727–2730

(value, fallback = 0)

        ctx.fillStyle = col; ctx.beginPath(); ctx.arc(x, yR, 4, 0, 2 * Math.PI); ctx.fill();
        ctx.strokeStyle = '#fff'; ctx.lineWidth = 1; ctx.stroke();
        const nm = sel.vendor || sel.addr || sel.short_addr;
        ctx.fillStyle = '#fff'; ctx.font = 'bold 10px sans-serif'; ctx.textAlign = 'left';
        ctx.fillText(`${(nm || '').slice(0, 20)}  ${sel.proto} ch${sel.channel}  ${sel.rssi} dBm`, r24.x0 + 3, yR - 5);
    }
}

// Draw the BLE advertising-channel markers (37/38/39) and a band-wide