LoPy Scanner

Scan all the possible transmission configurations of LoRa with LoPy hardware. Record PRR (Packet Reception Rate), SNR and received Spreading Factor.

Python3, mycroPython

Components

• 2x LoPy, one will be sender the other receiver
• 2x network connected gateways (e.g. Raspberry Pi)

Architecture

• LoRa sender and receiver
• controllers: client and server
• the controllers interface with the LoPy HW over serial; this is inspired by AmPy: https://github.com/adafruit/ampy
• sender and receiver execute one function, run_one_round(configuration)
  • this function configures LoRa with: SF, BW, CR, TXPow
• the client controller generates all the configurations, and for each config:
  • sends the config via UDP to the server controller
  • waits for a defined interval so the receiver is ready
  • tells the sender to execute run_one_round
• the server controller waits for the configuration packets, and tells the LoPy to
  • first cancel any running execution
  • save the current results to Flash, download them locally, delete from Flash
  • reboot
  • run_one_round with received configuration.

Quirks

• very little memory available on LoPy, so used separate Arrays instead of lists to save the packet statistics.