/challenges-projects/project14/attackofthedrones/b/blog/posts/telegram-controlled-drone-3-preparation---telegram-botTelegram is a freeware, cross-platform, cloud-based instant messaging (IM) software. Telegram accounts are tied to telephone numbers and are verified by SMS. Users can add multiple devices to their accounts and receive messages on all of them. Connecen-USTelligent Community 12