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This is a demo for Semtech LoRa SX1272MB2xAS 868MHz and NUCLEO-F401RE (STM Cortex M4).
The evaboard SX1272MB2xAS is based on SX1272
We tested this SW on NUCLEO-F401RE

How to use this eample
Results of my rtx LoRa tests on field
LoRa setup suggested
Software ready to use for mBed
dBm to W conversion calculator
LoRa link

How to use this eample:

Program two kits (NUCLEO-F401RE + SX1272MB2xAS) with my SW.
Connect the KITs to the PC and open a terminal emulation (for example TeraTerm).
The TeraTerm configurations are shown below.

9600 bauds
8 bit data
no parity
1 bit stop
no flow control

On the TeraTerm you see the link informations. See below.
On the NUCLEO-F401RE, if all is OK, you must see the GREEN led that flashing quickly. This means that the two KITs are working properly.
If the GREEN led flash slowly means that is not present the link between the two KITs.

Below there are the results of my rtx LoRa tests on field.

Important NOTE:
The TX outpower used for the tests shown below was set to: +14 dBm (25mW)
The max power output of the SX1272 is +20 dBm (100mW)

LoRa setup suggested:

+14dBm
B=500KHz; SF=7 - about 22Kbps
B=250KHz, SF=12 - about 590bps
B=125KHz, SF=11 - about 300bps

SF (Spreading Factor) table (datasheet pg.25)

B (Bandwidth) table refered to SF 12 (datasheet pg.26)

Example LoRa Modem Performances (datasheet pg.23)

My LoRa software, ready to use for mBed is here.

Note:
The original sw is here, the name is: SX1272 Ping Pong Demo Application

dBm to W conversion calculator is here.

+10 dBm == 10  mW

+11 dBm == 13  mW

+14 dBm == 25  mW

+20 dBm == 100 mW