Updated field test with FSK

New range test...

Fix comment

AGC is used, set RSSI threshold to correct (default) value (#8)

Update README.md

Fix comment

Update README.md

Add SX1276 datasheet and AN1200.24

New FSK range test

Some recommendations from Semtech AN1200.24 (#7) ...

- settings that might improve range and power consumption
- excluding settings specifically for LoRaWAN (i.e. sync word)

Another range test

Set BW = 41.7 kHz and SF = 10 for some more range

Simplify README.md

Add LoRa range test

Fix handling payload length on Tx (#6)

Enable low data rate optimization... ...

...as it improves the RSSI by quite a few dBm

Update README.md

Use LNA boost as it does improve the RSSI ...

+ fix comment

Add data sheet

Disable builtin rules of make (#5) ...

- so it won't try to build Makefile.o

Fix/improve comments

Complete renaming of .h file

Always disable timeout

Do not change output power from within the library

Make broadcast address configurable

Update README.md

Rename to librfm95 (#4)

Implement LoRa mode (#3) ...

* Prepare for LoRa mode
* Initialization of LoRa mode
* Partial impl. of LoRa mode
- writing/reading packet missing
* TX and RX in LoRa mode initially working
* Read RSSI and CRC, 62.5 kHz/SF 9, refactoring, README.md
* Clear 'TxDone' interrupt before going to Tx mode
* Update README.md
* LoRa mode has no address filtering (for now)
* Test FSK + small change in DIO4/timeout interrupt handling
- if DIO4 mapping is 00, an interrupt occurs while setting rx mode,
  which seems to break/hang SPI communication

Interrupts (#2) ...

- add "unblocking" timeout + minor improvements
- register interrupts instead of considering only the latest

Update README.md