Fixing the missing references for #LoRaWAN on Apache #NuttX OS

https://docs.google.com/spreadsheets/d/12EFS72JFjjuK-2yWQVYrImkUjyEA_iGlnsEu1d42r68/edit#gid=0

#LoRaWAN on #NuttX OS: Let's stub out the functions for Non-Volatile Memory and Real Time Clock ... And watch what happens 🌋

https://github.com/lupyuen/LoRaMac-node-nuttx/blob/master/src/nuttx.c

#LoRaWAN builds OK on #NuttX OS! 🎉 ... Will it run? 🤔

https://github.com/lupyuen/incubator-nuttx/tree/lorawan

https://github.com/lupyuen/incubator-nuttx-apps/tree/lorawan

#LoRaWAN on #NuttX OS sends a Join Request to the LoRaWAN Gateway ... But the values are incorrect though 🤔

Run Log: https://gist.github.com/lupyuen/b91c1f88645eedb813cfffa2bdf7d7a0

LoRa Frequency and Sync Word are OK ... Let's fix the Device EUI and Join EUI for #LoRaWAN on #NuttX OS

Run Log: https://gist.github.com/lupyuen/b91c1f88645eedb813cfffa2bdf7d7a0

#LoRaWAN gets its Device EUI, Join EUI and App Key from the Secure Element ... But since #NuttX doesn't have a Secure Element, we hardcode them in the "Soft" Secure Element

https://github.com/lupyuen/LoRaMac-node-nuttx/blob/master/src/peripherals/soft-se/se-identity.h#L65-L79

For #NuttX OS we hardcode the #LoRaWAN App Key ... Into the "Soft" Secure Element

https://github.com/lupyuen/LoRaMac-node-nuttx/blob/master/src/peripherals/soft-se/se-identity.h#L100-L115

Let's connect Apache #NuttX OS to a #LoRaWAN Gateway ... RAKwireless WisGate D4H with ChirpStack

https://lupyuen.github.io/articles/wisgate

#LoRaWAN Gateway receives the Join Request from #NuttX OS ... And accepts the Join Request! 🎉

Run Log: https://gist.github.com/lupyuen/a8e834e7b4267345f01b6629fb7f5e33

#NuttX OS doesn't handle the Join Response from #LoRaWAN Gateway ... Let's fix this

Run Log: https://gist.github.com/lupyuen/a8e834e7b4267345f01b6629fb7f5e33

Our #NuttX App was waiting for the #LoRaWAN Join Request to be transmitted before receiving the Join Response ... But because we're polling SX1262, we missed the Join Response ... Let's fix this with the multithreading functions from NimBLE Porting Layer

Log: https://gist.github.com/lupyuen/d3d9db37a40d7560fc211408db04a81b

NimBLE Porting Layer is a portable library of Multithreading Functions ... We've used it for #LoRa on Linux and FreeRTOS ... Now we call it from Apache #NuttX OS

https://github.com/lupyuen/nimble-porting-nuttx

To build NumBLE Porting Layer on #NuttX OS we need to enable: 1️⃣ POSIX Timers & Message Queues 2️⃣ Clock Monotonic 3️⃣ Work Queues 4️⃣ SIGEV_THHREAD

https://github.com/lupyuen/nimble-porting-nuttx

#LoRaWAN runs neater on Apache #NuttX OS ... After implementing Timers and Multithreading with NimBLE Porting Layer ... No more polling and sleep()!

https://gist.github.com/lupyuen/cad58115be4cabe8a8a49c0e498f1c95

Here's our #LoRaWAN Event Loop for #NuttX OS ... Implemented with NimBLE Porting Library ... No more polling!

https://github.com/lupyuen/incubator-nuttx-apps/blob/lorawan/examples/lorawan_test/lorawan_test_main.c#L814-L857

Here's how we check the SX1262 Busy Pin on #NuttX OS ... By reading the GPIO Input

https://github.com/lupyuen/lora-sx1262/blob/lorawan/src/sx126x-nuttx.c#L184-L199

SX1262 will trigger a GPIO Interrupt on #NuttX OS when it receives a #LoRa Packet ... We wait for the GPIO Interrupt to be Signalled in a Background Thread

https://github.com/lupyuen/lora-sx1262/blob/lorawan/src/sx126x-nuttx.c#L742-L778

We handle GPIO Interrupts (SX1262 DIO1) in a #NuttX Background Thread ... Awaiting the Signal for GPIO Interrupt

https://github.com/lupyuen/lora-sx1262/blob/lorawan/src/sx126x-nuttx.c#L835-L861