Alpha release for CircuitPython 5.0.0-alpha.0

This pre-release is meant to be used with bleio in CircuitPython 5.0.0-alpha.0 and later. It is not backward compatible with bleio in CircuitPython 4.x.

• New UART_Client and Scanner functionality added.
• UART_Server moved from uart.py to uart_server.py.
• Refactoring of advertisement data code. Advertisements are now built in Python instead of in C.
• Various other updates and renamings.
• Beacon code improved.
• Examples updated.

Allow UARTServer.write() to write more than 20 bytes

Allow UARTServer.write() to write buffers of indefinite length.

Improve UARTServer example

Improve UARTServer example: now retries after connection dropped.

To use in CircuitPython, simply install the Adafruit CircuitPython bundle.

Read the docs for info on how to use it.

Initial release

Includes:

• LocationBeacon - an iBeacon-style beacon
• EddystoneURLBeacon
• UARTServer - a Peripheral running an implementation of the Nordic UART Service (NUS). Provides a stream interface for reading.

[note - not yet in bundle as of the date of this release, but will be added soon]

To use in CircuitPython, simply install the Adafruit CircuitPython bundle.

Read the docs for info on how to use it.