{"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\/pt\/blog\/news\/meshtastic-realizacziya-samodostatochnoj-mesh-seti-na-baze-peredatchikov-lora","title":{"rendered":"Meshtastic — implementa\u00e7\u00e3o de uma rede mesh autossuficiente baseada em transmissores LoRa","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

O projeto Meshtastic desenvolve uma plataforma de comunica\u00e7\u00e3o aberta para criar uma rede de transmiss\u00e3o de mensagens descentralizada e autossuficiente, onde cada ponto da rede se conecta atrav\u00e9s de pontos vizinhos, sem o uso de roteadores centralizados. Para a transmiss\u00e3o do sinal, s\u00e3o utilizados transceptores baseados no protocolo LoRa, permitindo a transmiss\u00e3o de dados na faixa de frequ\u00eancia n\u00e3o licenciada a velocidades de alguns kilobits por segundo, a dist\u00e2ncias que podem variar de dezenas at\u00e9 centenas de quil\u00f4metros (os usu\u00e1rios do Meshtastic estabeleceram um recorde de 254 km). <\/p>\n

O projeto pode ser usado para organizar comunica\u00e7\u00f5es em \u00e1reas remotas, durante opera\u00e7\u00f5es de busca ou na pr\u00e1tica de esportes (como parapente) em locais sem infraestrutura ou em condi\u00e7\u00f5es de cobertura celular prec\u00e1ria. Em determinados locais, os participantes podem instalar transceptores aut\u00f4nomos, que retransmitem mensagens e s\u00e3o alimentados por pain\u00e9is solares, enquanto os pr\u00f3prios participantes podem ter dispositivos LoRa locais que transmitem sinais e s\u00e3o controlados atrav\u00e9s de conex\u00e3o a smartphones via protocolo Bluetooth.

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

Cada participante da rede pode enviar e visualizar mensagens de texto, assim como utilizar recursos de geolocaliza\u00e7\u00e3o baseados em GPS para encontrar outros participantes. Gra\u00e7as \u00e0 constru\u00e7\u00e3o da rede mesh, as mensagens s\u00e3o retransmitidas em cadeia, permitindo que cada membro do grupo receba mensagens do participante mais distante, independentemente da possibilidade de estabelecer um canal direto de comunica\u00e7\u00e3o com ele. \u00c9 poss\u00edvel enviar tanto mensagens de broadcast quanto mensagens endere\u00e7adas a um participante espec\u00edfico. As mensagens transmitidas s\u00e3o criptografadas utilizando chaves PSK (pre-shared key) previamente escolhidas e o algoritmo AES256. <\/p>\n

O protocolo de transmiss\u00e3o \u00e9 bastante simples: cada pacote \u00e9 enviado em modo de difus\u00e3o, ap\u00f3s o qual o meio \u00e9 analisado quanto \u00e0 chegada da confirma\u00e7\u00e3o de recebimento de um dos participantes. Se a confirma\u00e7\u00e3o n\u00e3o for recebida, s\u00e3o feitas mais tr\u00eas tentativas de envio ap\u00f3s um determinado tempo limite. Ao receber um pacote, \u00e9 realizada uma verifica\u00e7\u00e3o para determinar se esse pacote j\u00e1 foi recebido anteriormente; se sim, ele \u00e9 ignorado, caso contr\u00e1rio \u2014 retransmitido para outros participantes. A cada transmiss\u00e3o, o contador de saltos no pacote \u00e9 reduzido e, ao atingir zero, a retransmiss\u00e3o do pacote \u00e9 interrompida. <\/p>\n

O c\u00f3digo de firmware para os transceptores \u00e9 escrito em C\/C++ e \u00e9 distribu\u00eddo sob a licen\u00e7a GPLv3. Aplicativos m\u00f3veis adicionais para trabalhar com a rede mesh via smartphones nas plataformas Android e iOS tamb\u00e9m s\u00e3o fornecidos, al\u00e9m de uma interface web e uma biblioteca Python para automatizar o envio e recebimento de mensagens. Os firmwares s\u00e3o preparados para diversas placas baseadas em chips ESP32, nRF52 e RP2040, como o RAK Meshtastic Start Kit (RAK4631 nRF52840, RAK11200 ESP32, RAK11310 RP2040), Station G1, LILYGO LoRa T3-S3, Nano G1, HELTEC LoRa V3 e Raspberry Pi Pico com m\u00f3dulo SX1262.

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

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