{"id":112830,"date":"2024-01-11T21:10:13","date_gmt":"2024-01-11T19:10:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/meshtastic-realizacziya-samodostatochnoj-mesh-seti-na-baze-peredatchikov-lora"},"modified":"2024-01-11T21:10:13","modified_gmt":"2024-01-11T19:10:16","slug":"meshtastic-realizacziya-samodostatochnoj-mesh-seti-na-baze-peredatchikov-lora","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/meshtastic-realizacziya-samodostatochnoj-mesh-seti-na-baze-peredatchikov-lora","title":{"rendered":"Meshtastic \u2014 implementering af et selvforsynende mesh-netv\u00e6rk baseret p\u00e5 LoRa sendere","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Meshtastic-projektet udvikler en \u00e5ben kommunikationsplatform til opbygning af et selvforsynende decentraliseret netv\u00e6rk til datakommunikation, hvor hvert netv\u00e6rkspunkt forbindes gennem nabopunkter uden brug af centraliserede routere. Signaltransmission foreg\u00e5r ved hj\u00e6lp af transceivere baseret p\u00e5 LoRa-protokollen, der muligg\u00f8r dataoverf\u00f8rsel i et ureguleret frekvensomr\u00e5de med hastigheder p\u00e5 flere kilobit pr. sekund over afstande p\u00e5 titusinder eller endda hundredevis af kilometer (brugere af Meshtastic har sat en rekord p\u00e5 254 km). <\/p>\n

Projektet kan anvendes til at organisere kommunikation i sv\u00e6rt tilg\u00e6ngelige omr\u00e5der, ved s\u00f8gninger eller under sportsaktiviteter (f.eks. paraglidning) i omr\u00e5der uden infrastruktur eller under d\u00e5rlige d\u00e6kningsforhold fra mobiloperat\u00f8rer. I visse omr\u00e5der kan deltagerne placere autonome modtagere, der genudsender beskeder og f\u00e5r str\u00f8m fra solpaneler, og deltagerne kan have lokale LoRa-enheder, der sender signaler og styres via forbindelse til smartphones over Bluetooth-protokollen.

\"Meshtastic<\/center> <\/p>\n

Hver deltager i netv\u00e6rket kan sende og se tekstbeskeder samt bruge geolokaliseringsv\u00e6rkt\u00f8jer baseret p\u00e5 GPS til at finde andre deltagere. Takket v\u00e6re opbygningen af et mesh-netv\u00e6rk videresendes meddelelser i k\u00e6den, hvilket g\u00f8r det muligt for alle i gruppen at modtage beskeder fra den mest afstandede deltager, uanset muligheden for at etablere en direkte kommunikationskanal med vedkommende. Det er muligt at sende b\u00e5de broadcast- og adressebeskeder, der er rettet til en bestemt deltager. De sendte meddelelser krypteres ved hj\u00e6lp af p\u00e5 forh\u00e5nd valgte PSK-n\u00f8gler (pre-shared key) og AES256-algoritmen. <\/p>\n

Overf\u00f8rselsprotokollen er tilstr\u00e6kkeligt simpel: hver pakke sendes i broadcasts, hvorefter kanalen analyseres for at bekr\u00e6fte modtagelsen af en af deltagerne. Hvis bekr\u00e6ftelsen ikke er modtaget, foretages der yderligere tre fors\u00f8g p\u00e5 at sende efter en bestemt timeout. N\u00e5r en pakke modtages, kontrolleres det, om denne pakke er blevet modtaget tidligere; hvis ja, ignoreres den, og hvis nej - retransmitters den til de andre deltagere. Ved hver transmission reduceres hop-t\u00e6lleren i pakken, og n\u00e5r den n\u00e5r nul, stopper retransmissionen af pakken. <\/p>\n

Firmware koden til sender-modtagerne er skrevet i C\/C++ og distribueres under GPLv3 licens. Derudover tilbydes mobil applikationer til at arbejde med mesh-netv\u00e6rket fra smartphones p\u00e5 Android og iOS, samt et webinterface og en Python-bibliotek til automatisering af sending og modtagelse af beskeder. Firmwaren er forberedt til forskellige platforme baseret p\u00e5 chipene ESP32, nRF52 og RP2040, s\u00e5som RAK Meshtastic Start Kit (RAK4631 nRF52840, RAK11200 ESP32, RAK11310 RP2040), Station G1, LILYGO LoRa T3-S3, Nano G1, HELTEC LoRa V3 og Raspberry Pi Pico med SX1262 modulet.

\"Meshtastic\"Meshtastic\"Meshtastic<\/center>
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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