The redditor is correct.

Lora max is 256 bytes per packet.
LoraWAN max is 222 bytes per packet.

https://www.sciencedirect.com/topics/computer-science/maximum-packet-size

4.2.1.6 Packet structure and time on air

Fig. 4–4 shows the packet structure used by LoRa. LoRa offers a maximum packet 
size of 256 bytes. More details on the LoRa packet structure can be found in 
[5]. For the purpose of this chapter, the main part of interest is the preamble 
that is a sequence of constant upchirps, two downchirps, and a quarter of 
upchirp.

https://arxiv.org/pdf/1607.08011

I am sad I missed this talk. I was dog tired last night.

Patrick



 ---- On Fri, 04 Jul 2025 00:00:25 -0700  Russell Senior <russ...@pdxlinux.org> 
wrote --- 
 > There were some questions at the talk that didn't get precise answers.
 > 
 >  From wikipedia (https://en.wikipedia.org/wiki/LoRa):
 > 
 >    "The LoRaWAN data rate ranges from 0.3 kbit/s to 50 kbit/s per channel."
 > 
 > I haven't found anything yet that talks authoritatively about packet 
 > size limits. A Reddit user suggested the maximum packet (payload?) size 
 > was 255 bytes, but it's Reddit, so apply appropriate error bars.
 > 
 > -- 
 > Russell
 > 
 > On 7/3/25 05:00, Russell Senior wrote:
 > > Tonight!
 > >
 > > On 6/25/25 00:25, Russell Senior wrote:
 > >> Who: Caleb Phillips
 > >> What: An Introduction to Meshtastic
 > >> Where: 1930 SW 4th Avenue, Portland, Oregon 97201-5304, Room 86-01
 > >> When: Thursday, July 3, 2025 at 7 PM
 > >> Why: The pursuit of technology freedom
 > >>
 > >> Summary:
 > >>
 > >> Meshtastic is an open source mesh network application for low power 
 > >> IoT devices. Rapidly reaching critical mass in Portland due to a fast 
 > >> growing user community and low cost and accessible platform, it 
 > >> provides an appealing playground for off grid and secure 
 > >> communications experimentation and infrastructure design. This talk 
 > >> will cover basics of the wireless tech, platform and hardware as well 
 > >> as demo introductory usage with built nodes.
 > >>
 > >> Bio:
 > >>
 > >> Caleb Phillips is featherless biped who is passionate about public 
 > >> domain software and science. His day job is at a government 
 > >> laboratory working on renewable energy technology and he comes from a 
 > >> background in academic wireless systems research, data science, 
 > >> statistical modeling and visualization. Locally he has done work with 
 > >> the Personal Telco Project and other organizations. His website is 
 > >> http://smallwhitecube.com.
 > >>
 > >>
 > >> PLUG is back at Portland State University. Thanks to the Computer 
 > >> Science Department and to Andrew Greenberg for hosting us! The room 
 > >> is in the basement of the PSU Engineering Building (also connected 
 > >> underground to the Fourth Avenue Building, or FAB). Enter through the 
 > >> Engineering Building. The outside door will be locked, but there 
 > >> should be someone present at the entrance to let you in starting at 
 > >> 6:40pm until 7pm. There will be a sign on the door with a phone 
 > >> number you can SMS if there isn't someone there to let you in 
 > >> immediately.
 > >>
 > >> https://calagator.org/events/1250482087
 > >>
 > >> With luck, the talk will also be streamed live here: 
 > >> http://www.twitch.tv/kngbwlf, and later posted to YouTube.
 > >>
 > >
 > 
 > 

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