Issue while recieving null character

Hello guys,

I am using quectel M65 module. I am using Opencpu method with UART & MQTT API’s. Whenever i try to send data which consists of multiple null character it will stop asa null character is detected.
Functions which i use is as mentioned below,
Ql_Mqtt_Recv_Register(mqtt_recv);
ReadSerialPort(port, m_Read_Buffer, sizeof(m_Read_Buffer));

Please help.