Lup Yuen Lee 李立源 @lupyuen@qoto.org

LLVM: Chat with Chris Lattner

https://www.hpcwire.com/2021/12/27/lessons-from-llvm-an-sc21-fireside-chat-with-chris-lattner/

#Linux Phone Roundup 2021

https://fossphones.com/1228-news.html

Chinese Painting Generator: Understanding the generative art

https://zverok.github.io/blog/2021-12-28-grok-shan-shui.html

Quantum Atomic Interferometer For Precision Motion Sensing

https://hackaday.com/2021/12/28/quantum-atomic-interferometer-for-precision-motion-sensing/

"The #PinePhone Pro is here (and it runs Mobian!)"

https://blog.mobian-project.org/posts/2021/12/28/pinephone-pro/

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

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

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

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

#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

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

#Pine64 PineTalk - Behind the curtains

https://www.pine64.org/2021/12/28/s02e04-pinetalk-behind-the-curtains/

Our #NuttX App sent an empty #LoRaWAN Message because our message is too long for LoRaWAN Data Rate 2 (max 11 bytes) ... Let's increase the Data Rate to 3

https://gist.github.com/lupyuen/5fc07695a6c4bb48b5e4d10eb05ca9bf

"Linux Rewind 2021"

https://youtu.be/PqC-Cx5KH6w

Our #LoRaWAN Gateway receives Data Packets from #NuttX OS! 🎉 The Message Payload is empty ... Let's figure out why 🤔

Log: https://gist.github.com/lupyuen/0d301216bbf937147778bb57ab0ccf89

After disabling logging, our #NuttX App successfully joins the #LoRaWAN Network! 🎉 Now we transmit some Data Packets over LoRaWAN

Log: https://gist.github.com/lupyuen/0d301216bbf937147778bb57ab0ccf89

Our #NuttX App was too busy to receive the #LoRaWAN Join Response ... Let's disable the logging

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

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

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

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