For #Arduino Fans: RAKwireless has a #WisBlock #LoRaWAN Tutorial ... We shall try this later

https://github.com/RAKWireless/WisBlock/tree/master/examples/communications/LoRa/LoRaWAN

The Node Layer (centre) in our #BL602 #LoRaWAN Driver handles the networking operations for our BL602 LoRaWAN Node ... It's called by the Application Layer (left)

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

What's MCPS in the #BL602 #LoRaWAN Driver? ... That's the "MAC Common Part Sublayer", which is defined in the Semtech LoRaWAN Stack

https://stackforce.github.io/LoRaMac-doc/LoRaMac-doc-v4.4.7/index.html

Semtech #LoRaWAN Stack is structured according to IEEE 802.15.4 ... Yep LoRaWAN shares the same legacy as Thread, Zigbee and 6LoWPAN! We shall port this #IoT Legacy to #BL602

https://en.wikipedia.org/wiki/IEEE_802.15.4

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 #LoRaWAN Protocol is explained in this thread: Encryption, Receive Window, Duty Cycle, ...

https://qoto.org/@lupyuen/105874847933603494

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

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

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

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

#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

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

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

😉

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

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

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

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

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