MeshCore-BitChat: bridge Bitchat phone chats onto a MeshCore LoRa mesh

Bitchat is a phone app that chats over a Bluetooth mesh with no internet, but Bluetooth only reaches people nearby. MeshCore is a LoRa mesh firmware for small radio boards that covers kilometers. MeshCore-BitChat, a fork of MeshCore by Juraj Bednar (jooray), adds a bridge between the two: a MeshCore companion node that also speaks Bitchat over BLE, so messages typed into Bitchat's #mesh channel show up on the MeshCore #mesh channel and MeshCore messages appear in Bitchat. Put one bridge where Bitchat users are (an office, apartment block or square) and it carries their messages onto the LoRa mesh and back. Prebuilt release binaries cover 19 ESP32 boards with full support; the author tested the Heltec Wireless Stick Lite V3 and LilyGo T-Lora V2.1 and recommends the Heltec (the LilyGo was slow). nRF52 boards build too but only pass short messages (under 256 bytes), so ESP32 is the recommended path. Setup is flash the release binary with esptool or a web flasher, connect the MeshCore web app over USB serial in Chrome or Edge, set the radio preset for your region and give the node a name; after that it runs on its own. Limits worth knowing: only the #mesh channel is bridged, no DMs, files, images or voice; there is no end-to-end encryption because the bridge decrypts and re-encrypts and the #mesh key is public; long messages are split into roughly 127-byte parts; the node's clock must be within 10 minutes (it can sync from Bitchat packets or be set from the MeshCore app); and it works only as a companion node, not a MeshCore repeater. MIT licensed, like MeshCore.