debug: log FFE4 frame length and type on receive

miniprogram/services/ble/connection.js

@@ -84,6 +84,7 @@ function handleNotification(frame) {
 function handleValueChange(res) {
   if (protocol.PROTOCOL_MODE === 'vendor_33') {
     var parsed = protocol.parseVendorStatus(res.value)
+    console.log('[BLE] FFE4 收到', protocol.bufferToBytes(res.value).length + '字节', parsed.type, '| raw:', parsed.raw_hex)
     emit('vendor_raw', parsed)
 
     if (parsed.type === 'heartbeat') {