Switch to write_all and add CLI #1
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The write method actually might result in fewer bytes being written than requested.
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Thank you for this example! It allows me to reproduce missing data on the wire on macOS with a FT232R based device.
As
writemight result in fewer bytes being written than requested, let's usewrite_allto rule this out. This PR also adds a CLI for specifying the port and some parameters for testing different scenarios without modifying the code.