WIP: get Heltec V3 working

clients/python/donglora/__init__.py

@@ -19,9 +19,17 @@ from cobs import cobs
 
 USB_VID_PID = "1209:5741"
 
+# Known USB-UART bridge VID:PIDs found on some board revisions.
+BRIDGE_VID_PIDS = {"10c4:ea60", "1a86:55d4", "1a86:7523", "0403:6001"}
+
 
 def find_port() -> str | None:
-    """Find the DongLoRa serial port by USB VID:PID."""
+    """Find the DongLoRa serial port by USB VID:PID.
+
+    Checks for native USB CDC-ACM first (1209:5741), then falls back to
+    known USB-UART bridge chips found on some board revisions.
+    """
+    bridge_match = None
     for path in sorted(glob.glob("/dev/ttyACM*")) + sorted(glob.glob("/dev/ttyUSB*")):
         try:
             result = subprocess.run(
@@ -33,11 +41,16 @@ def find_port() -> str | None:
             )
             vid = props.get("ID_VENDOR_ID", "").lower()
             pid = props.get("ID_MODEL_ID", "").lower()
-            if f"{vid}:{pid}" == USB_VID_PID:
+            vid_pid = f"{vid}:{pid}"
+            if vid_pid == USB_VID_PID:
                 return path
+            if bridge_match is None and vid_pid in BRIDGE_VID_PIDS:
+                bridge_match = path
         except Exception:
             continue
-    ports = sorted(glob.glob("/dev/ttyACM*"))
+    if bridge_match is not None:
+        return bridge_match
+    ports = sorted(glob.glob("/dev/ttyACM*")) + sorted(glob.glob("/dev/ttyUSB*"))
     return ports[0] if ports else None
 
 
@@ -345,7 +358,7 @@ def connect(port: str | None = None, timeout: float = 2.0) -> serial.Serial | Mu
         # No mux available — direct USB serial
     if port is None:
         port = wait_for_device()
-    ser = serial.Serial(port, timeout=timeout)
+    ser = serial.Serial(port, baudrate=115200, timeout=timeout)
     ser.reset_input_buffer()
     return ser
 

clients/rust/src/discovery.rs

@@ -13,18 +13,41 @@ pub const USB_VID: u16 = 0x1209;
 /// DongLoRa USB Product ID.
 pub const USB_PID: u16 = 0x5741;
 
+/// Known USB-UART bridge VID:PIDs found on some board revisions.
+const BRIDGE_VID_PIDS: &[(u16, u16)] = &[
+    (0x10C4, 0xEA60), // CP2102 (Silicon Labs)
+    (0x1A86, 0x55D4), // CH9102
+    (0x1A86, 0x7523), // CH340
+    (0x0403, 0x6001), // FT232R (FTDI)
+];
+
 /// Find the DongLoRa serial port by USB VID:PID.
 ///
+/// Checks for native USB CDC-ACM first (VID:PID 1209:5741), then falls
+/// back to known USB-UART bridge chips found on some board revisions.
 /// Returns the first matching port path, or `None` if no device is found.
 pub fn find_port() -> Option<String> {
     let ports = serialport::available_ports().ok()?;
+
+    // Prefer native USB (our custom VID:PID)
+    if let Some(port) = ports.iter().find(|p| {
+        matches!(
+            &p.port_type,
+            serialport::SerialPortType::UsbPort(info)
+                if info.vid == USB_VID && info.pid == USB_PID
+        )
+    }) {
+        return Some(port.port_name.clone());
+    }
+
+    // Fall back to known USB-UART bridge chips
     ports
         .into_iter()
         .find(|p| {
             matches!(
                 &p.port_type,
                 serialport::SerialPortType::UsbPort(info)
-                    if info.vid == USB_VID && info.pid == USB_PID
+                    if BRIDGE_VID_PIDS.contains(&(info.vid, info.pid))
             )
         })
         .map(|p| p.port_name)