自检增加4G信号强度

app/src/main/cpp/PhoneDevice.cpp

@@ -419,6 +419,10 @@ bool CPhoneDevice::SelfTest(std::string& result)
         result += "%%\r\n";
     }
 
+    result += "4G信号强度：";
+    result += std::to_string(m_signalLevel);
+    result += "\r\n";
+
     return true;
 }