[56543.148991] usb 1-1.4: USB disconnect, device number 3
[56604.597374] usb 1-1.4: new full-speed USB device number 4 using xhci_hcd
[56604.745456] usb 1-1.4: New USB device found, idVendor=0403, 
idProduct=6015, bcdDevice=10.00
[56604.745478] usb 1-1.4: New USB device strings: Mfr=1, Product=2, 
SerialNumber=3
[56604.745497] usb 1-1.4: Product: FT231X USB UART
[56604.745514] usb 1-1.4: Manufacturer: FTDI
[56604.745530] usb 1-1.4: SerialNumber: D309M352

pi@PiMeteo:~ $ lsusb 
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 0403:6015 Future Technology Devices International, 
Ltd Bridge(I2C/SPI/UART/FIFO)
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub

So the pi is seeing the device, but it is not allocating a tty in /dev to 
it.
You might just need to insmod a kernel module so it assigns a device in 
/dev to it.

Check your 'lsmod' output and see if the ftdi_sio device is loaded.  If 
not, load it with 'insmod' and see if that helps.

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