fix: BLE protocol handling matches actual device behavior

- discoverChars uses properties (write/notify) to distinguish FFE1
  command characteristic from FFE1 service UUID
- handleValueChange: vendor_33 mode emits vendor_status (FFE4 heartbeat)
  and vendor_data separately, no longer tries parseFrame on raw bytes
- parseVendorStatus handles 1-byte heartbeat and 33-byte state readback
  with proper IO1-IO5 field parsing

miniprogram/services/ble/connection.js

@@ -82,13 +82,20 @@ function handleNotification(frame) {
 }
 
 function handleValueChange(res) {
+  if (protocol.PROTOCOL_MODE === 'vendor_33') {
+    var bytes = protocol.bufferToBytes(res.value)
+    var uuid = (res.characteristicId || '').toUpperCase()
+    var isStatus = uuid.indexOf(CHAR.STATUS) !== -1
+    if (isStatus) {
+      emit('vendor_status', { raw: bytes, heartbeat: bytes[0] })
+    } else {
+      emit('vendor_data', { raw: bytes, hex: protocol.bytesToHex(bytes) })
+    }
+    return
+  }
   var frame = protocol.parseFrame(res.value)
   if (frame) {
     handleNotification(frame)
-    return
-  }
-  if (protocol.PROTOCOL_MODE === 'vendor_33') {
-    emit('status', protocol.parseVendorStatus(res.value))
   }
 }
 
@@ -104,9 +111,14 @@ function discoverChars(deviceId, serviceId, group) {
         for (var i = 0; i < chars.length; i++) {
           var c = chars[i]
           var uuid = c.uuid.toUpperCase()
+          var props = c.properties || {}
           if (uuid.indexOf(CHAR.DEVICE_INFO) !== -1) _chars.deviceInfo = { uuid: c.uuid, serviceId: serviceId }
-          if (uuid.indexOf(CHAR.COMMAND) !== -1) _chars.command = { uuid: c.uuid, serviceId: serviceId }
-          if (uuid.indexOf(CHAR.STATUS) !== -1) _chars.status = { uuid: c.uuid, serviceId: serviceId }
+          if (uuid.indexOf(CHAR.COMMAND) !== -1 && (props.write || props.writeNoResponse)) {
+            _chars.command = { uuid: c.uuid, serviceId: serviceId }
+          }
+          if (uuid.indexOf(CHAR.STATUS) !== -1 && props.notify) {
+            _chars.status = { uuid: c.uuid, serviceId: serviceId }
+          }
           if (uuid.indexOf(CHAR.BOND_INFO) !== -1) _chars.bondInfo = { uuid: c.uuid, serviceId: serviceId }
           if (uuid.indexOf(CHAR.OTA_CONTROL) !== -1) _chars.otaControl = { uuid: c.uuid, serviceId: serviceId }
           if (uuid.indexOf(CHAR.OTA_DATA) !== -1) _chars.otaData = { uuid: c.uuid, serviceId: serviceId }