Lup Yuen Lee 李立源 @lupyuen@qoto.org

Source Code for #LoRaWAN on Apache #NuttX OS

https://lupyuen.github.io/articles/lorawan3?6#download-source-code

Here's what we'll do with #LoRaWAN on Apache #NuttX OS

https://lupyuen.github.io/articles/lorawan3?5#lorawan-objective

#LoRaWAN on #Apache NuttX OS ... Here's what we'll do

https://lupyuen.github.io/articles/lorawan3?4#lorawan-objective

Here are the dependencies for #LoRaWAN on #NuttX OS

https://lupyuen.github.io/articles/lorawan3?3#dependencies

Here's why we ported Semtech's #LoRaWAN Stack to #NuttX OS ... With minimal changes

https://lupyuen.github.io/articles/lorawan3?2#small-steps

Tricky Perspective 😬

Porting #LoRaWAN to Apache #NuttX OS ... All shall be explained in this article

https://lupyuen.github.io/articles/lorawan3?1

How to inspect a #NuttX Stack Trace 👍

https://gist.github.com/lupyuen/ccfd90125f9a180b4cfb459e8a57b323

We handle #LoRaWAN Events in our #NuttX App ... With this Event Loop

https://lupyuen.github.io/articles/sx1262?91#event-loop

How we handle SX1262 GPIO Interrupts in #NuttX OS ... With NimBLE Porting Layer

https://lupyuen.github.io/articles/sx1262?90#multithreading-with-nimble-porting-layer

We handle SX1262 GPIO Interrupts in #NuttX with a Background Thread ... That inserts into an Event Queue

https://lupyuen.github.io/articles/sx1262?89#start-dio1-thread

Here's why we need GPIO Interrupts Triggered on Rising Edge for #LoRa on #NuttX

https://lupyuen.github.io/articles/sx1262?88#initialise-gpio

Switching a #NuttX GPIO Interrupt Pin to Trigger On Rising Edge ... Crashes with an Assertion Failure ... I'll submit a NuttX Issue, meanwhile I have disabled the assertion

https://github.com/lupyuen/incubator-nuttx/blob/lorawan/drivers/ioexpander/gpio.c#L544-L547

NimBLE Porting Layer doesn't work for multiple Callout Timers on #NuttX OS, unless we loop the thread ... Will submit a Pull Request to Apache NimBLE 👍

https://github.com/lupyuen/nimble-porting-nuttx/blob/master/porting/npl/nuttx/src/os_callout.c#L35-L70

#LoRaWAN tested OK on Apache #NuttX OS ... From #PineDio Stack BL604 @PINE64 to RAKwireless WisGate ... And back! 🎉

https://github.com/lupyuen/LoRaMac-node-nuttx

Here's how we send a #LoRaWAN Data Packet on #NuttX OS ... And validate the Packet Size before sending

https://github.com/lupyuen/lorawan_test/blob/main/lorawan_test_main.c#L311-L339

#LoRaWAN Gateway now receives the correct Data Packet from our #NuttX App! 🎉

https://gist.github.com/lupyuen/83be5da091273bb39bad6e77cc91b68d

#LoRaWAN Data Rate has been increased to 3 ... Max Message Size is now 53 bytes for our #NuttX App

https://gist.github.com/lupyuen/83be5da091273bb39bad6e77cc91b68d

Here's how we increase the #LoRaWAN Data Rate to 3 in our #NuttX App

https://github.com/lupyuen/lorawan_test/blob/main/lorawan_test_main.c#L57-L70

Our #NuttX App sent an empty #LoRaWAN Message because our message is too long for LoRaWAN Data Rate 2 (max 11 bytes) ... Let's increase the Data Rate to 3

https://gist.github.com/lupyuen/5fc07695a6c4bb48b5e4d10eb05ca9bf