Read dump1090 port 30003 ADSB messages line by line (linux, C)

dump1090_30003_line_by_line.c

#include <stdio.h> 
#include <sys/socket.h> 
#include <arpa/inet.h> 
#include <unistd.h> // read

// Dump1090 ip + port number
#define IP "192.168.1.12" // modify accordingly
#define PORT 30003

int main(int argc, char const *argv[]) 
{ 
	// Initialize socket connection with dump1090
	int sock = 0; 
	struct sockaddr_in serv_addr;

	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) 
	{ 
		printf("\n Socket creation error \n"); 
		return -1; 
	} 

	serv_addr.sin_family = AF_INET; 
	serv_addr.sin_port = htons(PORT); 
	
	// Convert IPv4 and IPv6 addresses from text to binary form 
	if(inet_pton(AF_INET, IP, &serv_addr.sin_addr)<=0) 
	{ 
		printf("\nInvalid address/ Address not supported \n"); 
		return -1; 
	} 

	// Actualy connect to the socket
	if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) 
	{ 
		printf("\nConnection Failed \n"); 
		return -1; 
	} 

	char char_buffer = 0; 
	char str_buffer[200] = {0}; // never seen more than 100 char msg, but safety first
	int cursor = 0; 
	
	// the goal is to read the socket one char at a time
	// then fill the string buffer and ending the string when a newline is catched
	while(1)
	{
    		// reading socket char by char
		read(sock, &char_buffer, 1);

		// if char is a new line => end of message
		if(char_buffer == '\n')
		{
			str_buffer[cursor] = '\0'; // end of string
			cursor = 0; // reset cursor
			printf("%s\n",str_buffer); // do what you want
		}
		else // char not a new line => message content
		{
			str_buffer[cursor] = char_buffer; // fill char at cursor
			cursor++; // increment cursor
		}	
	}

	return 0; 
}