0.13.0

0.13.0 - 2019.08.22

• Update bootloader binary to to 0.2.12 version (upgrade is optional)
• Added Circuit Playground Blueffuit nRF52840 support
• Added variant support for Particle Xenon, PR #317
• Added PDM support
• Switch compiler optimization from -Os to -Ofast
• Improve BLEConnection throughput
  • Added requestPHY() to initate PHY switching to 2 MB, 1MB
  • Added requestDataLengthUpdate() to initate Data Length Update process
  • Added requestMtuExchange() to iniate MTU exchange procoess
  • Added requestConnectionParameter() to initate connection parameter process
• Updated throughput and added central_throughput sketch (WIP)
• Added image_upload example
• Enhance mutex lock/unlock for fifo used by bleuart
• Fixed multiples warning with tinyUSB descriptor template, PR #322
• Fixed typo, PR #326