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--- title: 寫給對於還不熟悉 Meshtastic 的朋友 / DigiResiTh0n tags: digital-resilience, resilience, internet-shutdown, digiresi, civil-defense, 民防, 數位韌性松, DigiResiTh0n, hackathon, meshtastic, mesh, lora --- # [懶人包] 寫給對於還不熟悉 Meshtastic 的朋友 作者:@dryden(g0v slack) source: https://www.facebook.com/groups/meshtastictw/posts/413633161045882/ 寫給對於還不熟悉 Meshtastic 的朋友: Meshtastic 它是一個開放原始碼的專案,可以用來傳輸訊息 有著以下特點: - 低耗電 - 不需透過電信商基地台 - 長距離 - 單價便宜 - 不用執照等等的特點 因此我認爲,它或許會很適合做爲在臺灣,遇到大型災害時,斷電斷訊時的備援通訊方式: 大規模停電後 → 基地台備援用電用完 → 人們傳遞訊息的方式剩下無線電 → 屆時的無線電頻道應該跟上班時的日本地鐵一樣擠 \--- 我在兩週前,被 YT 演算法推薦到一個英國大叔的 Meshtastic 影片(放在留言處) 看了以後覺得或許可以用在臺灣,因此就買了幾個來實際測試看看! 目前實測的心得: 當我把裝置放在陽臺,我在戶外且可以看到陽臺的情況下 距離 535 公尺是可以收到訊號的(如附圖) 而在國外的實測,傳輸距離是公里起跳,甚至可以到上百公里 爲什麼國外的測試結果可以這麼遠? 除了有些人會用指向性天線以外, 也是因爲這專案使用的 LoRa 技術的特性: 只要是可視,就可以有長距離的傳輸 但如果中間被太多建築物擋住,距離就會受限 所以當我在都市內實測時,傳輸距離就有受限 那是不是就不適合拿來在臺灣使用了?非也 Meshtastic 這個開源專案,就針對上述的缺點做了改良 它讓每個使用者手上的裝置,都變成一個節點,會協助轉發訊息 因此假設目前有五個使用者,分別是 A B C D E 今天即便 A 因爲距離限制,沒辦法傳給 E 也可以透過轉發的方式,A → B → C → D 最後把訊息送到 E (如附圖二) 也因此,開了這個社團,徵集大家一起來玩玩看這個小裝置, 試驗看看是否能利用它的分散式設計, 做爲一種臺灣的備援通訊方式 需要的裝備: 1.Meshtastic 裝置:以臺灣目前可以快速買到的 Heltec ESP32 來說,一支只要 $760,如果是自己跟自己測試的話需要買兩支 $1,520 2.支援藍牙的 Android or iOS 手機 3.一顆行動電源,以 USB Type C 的方式供電給 Meshtastic 裝置 看到這裡 - 行動派的朋友,可以在線上購物買到上述的裝置 - 有興趣瞭解更多的朋友,可以點選留言的影片,瞭解更多細節 - 有問題的朋友也可以直接發問,我目前也是才剛上手而已,可以就我知道的內容一起討論

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