Add read the Syncword function

Add radio function to read the radio syncword

uint16_t syncword = Radio.GetSyncWord(void);

Add custom Syncword and Low DataRate optimization

• Add radio function to set a custom Syncword Radio.SetCustomSyncWord(uint16_t syncword);
• Add radio function to enforce Low DataRate optimization Radio.EnforceLowDRopt(bool enforce);
  Thanks to @rainerfritz and @jamcinnes2 for their contributions.

Access to NWsKey and AppsKey

Add functions to get network session key and app session key after join

Add missing header file

2.0.26

Add missing header file

Fix DR reset

With ADR enabled, the DR got reset to default when packet transmission mode changed between confirmed and unconfirmed mode.

Fix P2P RX timeout callback fails

Fix callbacks for P2P RX and TX timeout not being called

Add support for the Arduino Pico BSP

Added support for the RAK11300 in arduino-pico BSP still experimental

IRQ_HEADER_ERROR should issue RX error, not RX timeout

Change behaviour of IRQ_HEADER_ERROR, thanks to @JeromeBriot

Some fixes

• Fix public/private network always public
• Add option to restart MAC stack to change e.g. region without re-init timers

Add MAC counter reset function

2.0.20

Add MAC counter reset function