Lup Yuen Lee 李立源 @lupyuen@qoto.org

Porting pbuf Packet Buffer Queue from Mynewt OS to #BL602 ... Makes me hungry for Peanut Butter Jelly Sandwich 🤤

https://github.com/lupyuen/bl_iot_sdk/blob/lorawan/components/3rdparty/lorawan/src/pbuf_queue.c

Wut the cat...?

Apple vs LoRaWAN ... Scary 🤔

https://qoto.org/@lupyuen/106027691196962693

Programmable Logic Controllers are already using graphical programming ... So why not #BL602 ? 🤔

https://realpars.com/plc-programming-languages/

Rete.js seems to have better support for Graphical Flow Programming 🤔

https://rete.js.org/#/examples/customization

Can we use Graphical Flow Programming ... To connect Sensors (like BME280) to Network Transceivers (like #LoRa) on #BL602 ? 🤔

https://noflojs.org/tutorials/canadianness/

Our #LoRaWAN Driver uses Mbuf Queues (from Mynewt OS) ... We shall convert them to #BL602 pbuf Event Queues ... From the NimBLE Porting Library

https://github.com/lupyuen/bl_iot_sdk/blob/lorawan/components/3rdparty/lorawan/src/lora_app.c#L113-L145

Why #BL602 "pbuf" is OK for handling #LoRaWAN Packets

https://github.com/lupyuen/bl_iot_sdk/blob/lorawan/customer_app/sdk_app_lorawan/sdk_app_lorawan/pbuf.c#L96-L183

We verify that #BL602 "pbuf" Packet Buffers can handle a full #LoRaWAN Packet ... Header: 20 bytes, Max Payload: 255 bytes

https://github.com/lupyuen/bl_iot_sdk/blob/lorawan/customer_app/sdk_app_lorawan/sdk_app_lorawan/pbuf.c#L96-L183

Yep "pbuf" from the #BL602 Lightweight IP Stack can be used instead of Mbuf ... We just need to shift the Header / Payload Pointer to work on #LoRaWAN Packets

https://github.com/lupyuen/bl_iot_sdk/blob/lorawan/customer_app/sdk_app_lorawan/sdk_app_lorawan/pbuf.c

...Which explains why so many folks at STMicro are now reading this #BL602 #LoRaWAN Thread

😉

Here's a friendly doc by STMicro that explains MCPS Messaging in our #BL602 #LoRaWAN Driver

https://www.st.com/content/ccc/resource/technical/document/user_manual/group0/31/96/2f/3b/df/c1/40/2e/DM00300436/files/DM00300436.pdf/jcr:content/translations/en.DM00300436.pdf

The Dalai Lama ... On Religion

https://en.m.wikipedia.org/wiki/The_Art_of_Happiness

#BL602 IoT SDK has a "pbuf" in the lwIP Lightweight TCP/IP Stack ... Maybe our BL602 #LoRaWAN Driver can use this instead of Mbuf? 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/lorawan/components/network/lwip/src/include/lwip/pbuf.h#L185-L222

What's an Mbuf? Why is it used by our #BL602 #LoRaWAN Driver? Mbufs are Chains of Fixed-Size Blocks ... Works great with little RAM (no fragmentation) ... Created for BSD Unix in 1983!

https://mynewt.apache.org/latest/os/core_os/mbuf/mbuf.html

Uh-oh our #BL602 #LoRaWAN Driver (from Mynewt) passes LoRaWAN Packets in Mbuf Format ... Let's find something equivalent on BL602 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/lorawan/components/3rdparty/lorawan/src/lora_app.c#L260-L303

Curiously, our #BL602 #LoRaWAN Driver includes a Command-Line Interface (bottom) that Transmits and Receives LoRa Packets ... Directly calling the SX1276 Driver 🤔

https://github.com/lupyuen/bl_iot_sdk/blob/lorawan/components/3rdparty/lorawan/src/lora_cli.c

How shall we implement the #BL602 #LoRaWAN Event Queue for the Medium Access Control Layer? With the NimBLE Porting Layer of course!

https://lupyuen.github.io/articles/lora2#multitask-with-nimble-porting-layer

The Medium Access Control Layer (right) of our #BL602 #LoRaWAN Driver implements the LoRaWAN Protocol: Encryption, Receive Window, Duty Cycle, ... It exposes the MCPS Messaging Interface (IEEE 802.15.4) to the Node Layer (centre) via an Event Queue

https://github.com/lupyuen/bl_iot_sdk/blob/lorawan/components/3rdparty/lorawan/src/mac/LoRaMac.c

The Dalai Lama ... On Anger and Hatred

https://en.m.wikipedia.org/wiki/The_Art_of_Happiness