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

#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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Here are the dependencies for #LoRaWAN on #NuttX OS

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

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

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

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

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

Source Code for #LoRaWAN on Apache #NuttX OS

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

Setting the #LoRaWAN Device EUI and App Key in #NuttX OS

https://lupyuen.github.io/articles/lorawan3?7#device-eui-join-eui-and-app-key

Building a Secure #IoT Device? #LoRaWAN works with a Hardware Secure Element

https://lupyuen.github.io/articles/lorawan3?8#secure-element

Setting the #LoRaWAN Frequency for #NuttX OS

https://lupyuen.github.io/articles/lorawan3?9#lorawan-frequency

On #NuttX OS, NimBLE Porting Library needs POSIX Timers and Message Queues

https://lupyuen.github.io/articles/lorawan3?11#appendix-posix-timers-and-message-queues

Our #LoRaWAN Library needs a Strong Random Number Generator with Entropy Pool on #NuttX OS

https://lupyuen.github.io/articles/lorawan3?12#appendix-random-number-generator-with-entropy-pool

Building the #LoRaWAN Firmware for Apache #NuttX OS

https://lupyuen.github.io/articles/lorawan3?15#build-the-firmware

Running the #LoRaWAN Firmware for Apache #NuttX OS ... To join a LoRaWAN Network

https://lupyuen.github.io/articles/lorawan3?16#run-the-firmware

Here's how we join a #LoRaWAN Network in our #NuttX App

https://lupyuen.github.io/articles/lorawan3?17#join-lorawan-network

#NuttX joins #LoRaWAN Network ... Watch what happens at the LoRaWAN Gateway

https://lupyuen.github.io/articles/lorawan3?18#check-lorawan-gateway

Here's how we transmit a #LoRaWAN Data Packet in our #NuttX App

https://lupyuen.github.io/articles/lorawan3?19#send-data-to-lorawan

#LoRaWAN Max Message Size depends on 1️⃣ Data Rate 2️⃣ LoRaWAN Region

https://lupyuen.github.io/articles/lorawan3?20#message-size

How often can we send a #LoRaWAN Message? Check the LoRaWAN Airtime Calculator

https://lupyuen.github.io/articles/lorawan3?21#message-interval

Running our #LoRaWAN Firmware on Apache #NuttX OS ... And transmitting LoRaWAN Messages

https://lupyuen.github.io/articles/lorawan3?22#rerun-the-firmware

Inspecting the ChirpStack Log ... For #LoRaWAN Messages transmitted by Apache #NuttX OS

https://lupyuen.github.io/articles/lorawan3?23#check-lorawan-gateway-1

Here's why #LoRaWAN on #NuttX needs a Strong Random Number Generator (with Entropy Pool)

https://lupyuen.github.io/articles/lorawan3?24#lorawan-nonce

How we generate #LoRaWAN Nonces ... With the Strong Random Number Generator on #NuttX OS

https://lupyuen.github.io/articles/lorawan3?25#strong-random-number-generator

How we handle #LoRaWAN Events ... With NimBLE Porting Layer on Apache #NuttX OS

https://lupyuen.github.io/articles/lorawan3?26#lorawan-event-loop

Inside our #LoRaWAN Event Loop for Apache #NuttX OS

https://lupyuen.github.io/articles/lorawan3?27#lorawan-event-loop

Troubleshooting #LoRaWAN on Apache #NuttX OS

https://lupyuen.github.io/articles/lorawan3?28#troubleshoot-lorawan

#LoRaWAN is Time Sensitive! Here's why

https://lupyuen.github.io/articles/lorawan3?29#lorawan-is-time-sensitive

Watch out for Empty #LoRaWAN Message Payloads

https://lupyuen.github.io/articles/lorawan3?30#empty-lorawan-message