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Open only sainsmart boards #1

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LalunePierr0t
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Hi,

I had an issue, If plug 2 FTDI devices ( eg: 1 sainsmart, 1 usb ttl for linux debugging) and ran a serial terminal (like picocom)on the Usb/TTL, and the I use sainsmartrelay at the same time , I was disconnected from the serial terminal.
The root cause of this behavior is the fact that the sainsmart tool opens all FTDI vendor Id: 0x0403 and Product Id: 0x6001 devices.
But FTDI markets a whole host of different products using this vendor Id, and this product Id.
To distinguish between them, use their description. That's the aim of this PR.

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