XBee Python library 1.2.0

v1.2.0 - 07/05/2019

• Add new methods to send and receive data from other XBee interfaces through
  User Data Relay frames.
• Add new methods to manage the Bluetooth interface.
• Add support to set AT parameters without applying them with the AT Command
  Queue packet.
• Improve the callbacks mechanism:
  • Callbacks are now executed in parallel.
  • Internal callbacks are now defined when needed to avoid issues when more
    than one callback of the same type is defined.
• Add missing 'Transmit Status', 'Modem Status' and 'Cellular Association
  Indication Status' values to cover all XBee Cellular/XBee3 Cellular features.
• Bug Fixing:
  • Fix some bugs related to package spec data.
  • Log an error when processing a wrong frame instead of stopping the reader.
  • Fix an issue parsing Explicit RX Indicator packets.
  • Fix a couple of leaks with StreamHandlers.