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Offline networking: Difference between revisions
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[[File:Adafruit-lora-rpi.jpg|thumb|left|An Adafruit 915MHz RFM69HCW LoRa shield atop a Rasberry Pi Model 4, and connected to a 900MHz omnidirectional antenna.]] | [[File:Adafruit-lora-rpi.jpg|thumb|left|An Adafruit 915MHz RFM69HCW LoRa shield atop a Rasberry Pi Model 4, and connected to a 900MHz omnidirectional antenna.]] | ||
LoRa (from 'long range') is a communication protocol that allows for the transmitting and receiving of data in license-free portions of the radio spectrum. Together with LoRaWAN, it represents is an interesting low cost, low power, wide area networking platform, that can | LoRa (from 'long range') is a communication protocol that allows for the transmitting and receiving of data in license-free portions of the radio spectrum. Together with LoRaWAN, it represents is an interesting low cost, low power, wide area networking platform, that can be used to create robust mesh networks. Mobility, end-to-end security and location are all features implemented by the LoRa architecture. While the data rate of LoRa is significantly smaller than that of [[Cellular communications|cellular]] or wireless networks, operating from 0.3 kbit/s to 50 kbit/s per channel, it is sufficient for a diverse applications such as the sending of location information, messages and chat, status updates, sensor output, etc. The longest 2-way conversation between LoRa devices using less than 1 Watt of power is 206 km (128 miles)<ref>https://hackaday.com/2023/06/26/meshtastic-for-the-greater-good/</ref>. | ||
A practical mobile application of LoRa employs it in a small handset with keyboard and case such that it can be used for texting in off-grid contexts<ref>https://www.hackster.io/news/this-lora-messenger-is-perfect-for-texting-in-the-wilderness-108ed61aaace</ref>. The Meshtastic project provides a modular platform whereby LoRa hardware, battery, and case and antenna are purchased, a web-based flasher is used to deploy the software onto the hardware, and various interfaces to the hardware (including apps and web-based) are provided<ref>https://meshtastic.org/</ref>. | A practical mobile application of LoRa employs it in a small handset with keyboard and case such that it can be used for texting in off-grid contexts<ref>https://www.hackster.io/news/this-lora-messenger-is-perfect-for-texting-in-the-wilderness-108ed61aaace</ref>. The Meshtastic project provides a modular platform whereby LoRa hardware, battery, and case and antenna are purchased, a web-based flasher is used to deploy the software onto the hardware, and various interfaces to the hardware (including apps and web-based) are provided<ref>https://meshtastic.org/</ref>. | ||
== Linkdump == | == Linkdump == | ||