Reading uart hex values ignores certain bytes/characters - c++

Question

I'm new to C/C++ and I'm trying to make communication by uart using HEX values.
Device port: /dev/ttyS2. Baudrate: 38400
I'm using redis to subscribe the messages. And for testing I'm using "Termite", a RS232 terminal to simulate.
I found some guide that worked really fine, the problem is that when I try to read the message some bytes/characters mess with it.
Here is my code for the connection:
this->fd = open(device,O_RDWR | O_NOCTTY);
/*---------- Setting the Attributes of the serial port using termios structure --------- */
tcgetattr(this->fd, &SerialPortSettings); /* Get the current attributes of the Serial port */
/* Setting the Baud rate */
cfsetispeed(&SerialPortSettings,B38400); /* Set Read Speed as 38400 */
cfsetospeed(&SerialPortSettings,B38400); /* Set Write Speed as 38400 */
/* 8N1 Mode */
SerialPortSettings.c_cflag &= ~PARENB; /* Disables the Parity Enable bit(PARENB),So No Parity */
SerialPortSettings.c_cflag &= ~CSTOPB; /* CSTOPB = 2 Stop bits,here it is cleared so 1 Stop bit */
SerialPortSettings.c_cflag &= ~CSIZE; /* Clears the mask for setting the data size */
SerialPortSettings.c_cflag |= CS8; /* Set the data bits = 8 */
SerialPortSettings.c_cflag &= ~CRTSCTS; /* No Hardware flow Control */
SerialPortSettings.c_cflag |= CREAD | CLOCAL; /* Enable receiver,Ignore Modem Control lines */
SerialPortSettings.c_iflag &= ~(IXON | IXOFF | IXANY); /* Disable XON/XOFF flow control both i/p and o/p */
SerialPortSettings.c_iflag &= ~(ICANON | ECHO | ECHOE | ISIG); /* Non Cannonical mode */
SerialPortSettings.c_oflag &= ~OPOST; /*No Output Processing*/
SerialPortSettings.c_oflag = 0;
/* Setting Time outs */
SerialPortSettings.c_cc[VMIN] = 1; /* Read at least X characters */
SerialPortSettings.c_cc[VTIME] = 0; /* Wait indefinetly */
tcflush(this->fd, TCIFLUSH);
if((tcsetattr(this->fd,TCSANOW,&SerialPortSettings)) != 0) { /* Set the attributes to the termios structure*/
printf("\n ERROR ! in Setting attributes");
}
else {
tcsetattr(fd, TCSANOW, &SerialPortSettings);
printf("\n BaudRate = 38400 \n StopBits = 1 \n Parity = none\n\n");
}
And here is the code for reading:
char read_buffer[32];
int bytes_read;
while(true) {
bytes_read = read(serialport.fd, &read_buffer, sizeof(read_buffer)); /* Read the data */
printf("bytes read: %d", bytes_read);
if (bytes_read < 0) {
printf("Error reading: %s", strerror(errno));
}
else if (bytes_read > 0) {
//read_buffer[bytes_read] = '\0';
printf("\n");
printf("HEX:");
for (int i=0; i<bytes_read; i++) { /*printing only the received characters*/
printf(" %02x",read_buffer[i]);
}
printf("\n");
printf("+----------------------------------+\n");
/*#if defined(MODULE_REDIS) || defined(MODULE_ALL)
//redis.publish("channel:uart:ack", read_buffer);
redis.publish("channel:uart:ack", vectorUint8toHex(read_data).c_str());
#endif*/
}
std::this_thread::sleep_for(std::chrono::milliseconds(1));
}
When I send the message 0x2401010203040506070809af23, it only shows 8 bytes. (the bytes 0x03 and 0x04 messes with the message)
OUTPUT:
bytes read: 0bytes read: 8
HEX: 05 06 07 08 09 af 23 0a
+----------------------------------+
But when I send 0x2401010200000506070809af23, it works fine
OUTPUT:
bytes read: 14
HEX: 24 01 01 02 00 00 05 06 07 08 09 af 23 0a
+----------------------------------+
What I'm doing wrong? And one more thing. Using Termite have to turn the "append LF" setting or else I can't read the message, but that adds "0a" to my message, is this related to the configurations of the serial port?

Answer 1

Ok, so the problem was that some bytes in binary were 0x03 and 0x04 that are in ASCII "end of text" and "end of transmission". And was missing this line on the configurations:
SerialPortSettings.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN | ISIG);
Thanks to the comments, I searched for some missing configurations and found it.
There's another post for my problem that I didn't found at the time:
Binary serial port read missing bytes in c