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

Our #NuttX Background Thread handles the GPIO Interrupts (SX1262 DIO1) ... By adding to the #LoRaWAN Event Queue

https://github.com/lupyuen/lora-sx1262/blob/lorawan/src/sx126x-nuttx.c#L863-L892

Our #NuttX App resends the same Nonce to the #LoRaWAN Gateway ... Which (silently) rejects the Join Request due to Duplicate Nonce ... Let's fix our Random Number Generator

https://gist.github.com/lupyuen/b38434c3d27500444382bb4a066691e5

#LoRaWAN gets the Nonce from the Secure Element's Random Number Generator ... Let's simulate the Secure Element on Apache #NuttX OS

https://github.com/lupyuen/LoRaMac-node-nuttx/blob/master/src/mac/LoRaMacCrypto.c#L980-L996

We enable the Entropy Pool in #NuttX OS ... To generate Strong Random Numbers for our #LoRaWAN Nonce

For #NuttX Random Number Generator, select the Entropy Pool ... To generate Strong Random Numbers for our #LoRaWAN Nonce

Here's how we generate #LoRaWAN Nonces on #NuttX OS ... With Strong Random Numbers thanks to Entropy Pool

https://github.com/lupyuen/LoRaMac-node-nuttx/blob/master/src/nuttx.c#L136-L153

Our #NuttX App now sends Random #LoRaWAN Nonces to the LoRaWAN Gateway ... And are happily accepted by the gateway! 🎉

Log: https://gist.github.com/lupyuen/8f012856b9eb6b9a762160afd83df7f8