expo-ble模块测试demo 联调BLE模块 take 8 新增空数据包测试

ble/services/BleProtocolService.ts

@@ -148,7 +148,16 @@ export class BleProtocolService {
             payload = new Uint8Array(Buffer.from(jsonStr));
         }
 
-        const frames = ProtocolManager.createFrame(type, payload);
+        const device = this.client.getConnectedDevice();
+        const mtu = device?.mtu || 23;
+        // MTU - 3 bytes (ATT overhead) - Protocol Header - Protocol Footer
+        const maxPayloadSize = mtu - 3 - FRAME_CONSTANTS.HEADER_SIZE - FRAME_CONSTANTS.FOOTER_SIZE;
+        // Ensure reasonable bounds (at least 1 byte, max constrained by protocol constant)
+        const safeMaxDataSize = Math.max(1, Math.min(maxPayloadSize, FRAME_CONSTANTS.MAX_DATA_SIZE));
+
+        console.debug(`[BleProtocolService] Sending with MTU=${mtu}, maxDataSize=${safeMaxDataSize}`);
+
+        const frames = ProtocolManager.createFrame(type, payload, FRAME_CONSTANTS.HEAD_APP_TO_DEVICE, true, safeMaxDataSize);
         const total = frames.length;
         console.debug(`Sending ${total} frames`);
         for (let i = 0; i < total; i++) {
@@ -160,6 +169,7 @@ export class BleProtocolService {
             if (onProgress) {
                 onProgress((i + 1) / total);
             }
+
             console.debug("Wrote frame", result);
         }
     }