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//
// arduino-serial-server -- web-based service for serial port
//
// This is just an idea. It doesn't work yet.
//
//
//
#include <stdio.h> // Standard input/output definitions
#include <stdlib.h>
#include <string.h> // String function definitions
#include <unistd.h> // for usleep()
#include <getopt.h>
#include "mongoose.h"
#include "arduino-serial-lib.h"
static int fd;
//
static void get_qsvar(const struct mg_request_info *request_info,
const char *name, char *dst, size_t dst_len) {
const char *qs = request_info->query_string;
mg_get_var(qs, strlen(qs == NULL ? "" : qs), name, dst, dst_len);
}
//
static void *callback(enum mg_event event,
struct mg_connection *conn,
const struct mg_request_info *request_info)
{
const int buf_max = 1000;
char result[buf_max] = "none";
if (event == MG_NEW_REQUEST) {
//const char* uri = request_info->uri;
// get query args
char cmd[32];
char str[256];
get_qsvar(request_info, "cmd", cmd, sizeof(cmd));
get_qsvar(request_info, "str", str, sizeof(str));
if( ! cmd[0] ) { // cmd is empty
/// do something useful here
}
else {
if( strcasecmp(cmd, "read")==0 ) {
serialport_flush(fd);
serialport_read_until(fd, str, '\n', buf_max);
sprintf(result, "read:\n%s\n",str); // debug
}
else if( strcasecmp(cmd, "send")==0 ) {
serialport_write(fd, str);
sprintf(result, "send:\n%s\n",str);
}
else {
sprintf(result, "uknown cmd '%s'",cmd);
}
}
printf("result:%s\n",result);
// Echo requested URI back to the client
mg_printf(conn, "HTTP/1.1 200 OK\r\n"
"Content-Type: text/plain\r\n\r\n"
"%s"
"\n",
result
);
return ""; // Mark as processed
} else {
return NULL;
}
}
void error(char* msg)
{
fprintf(stderr, "%s\n",msg);
exit(EXIT_FAILURE);
}
//
void usage(void)
{
printf("Usage: arduino-serial -p <serialport> [OPTIONS]\n"
"\n"
"Options:\n"
" -h, --help Print this help message\n"
" -P, --httpport=httpport HTTP port to listen on (default 8080)\n"
" -p, --serialport=serialport Serial port Arduino is on\n"
" -b, --baud=baudrate Baudrate (bps) of Arduino (default 9600)\n"
"\n");
exit(EXIT_SUCCESS);
}
//
int main(int argc, char *argv[])
{
struct mg_context *ctx;
int baudrate = 9600; // default
char httpport[16] = "8080";
char serialport[256];
/* parse options */
int option_index = 0, opt;
static struct option loptions[] = {
{"help", no_argument, 0, 'h'},
{"httpport", required_argument, 0, 'P'},
{"serialport", required_argument, 0, 'p'},
{"baud", required_argument, 0, 'b'},
{"quiet", no_argument, 0, 'q'},
{NULL, 0, 0, 0}
};
while(1) {
opt = getopt_long (argc, argv, "hP:p:b:q",
loptions, &option_index);
if (opt==-1) break;
switch (opt) {
case '0': break;
case 'h':
usage();
break;
case 'b':
baudrate = strtol(optarg,NULL,10);
break;
case 'p':
strcpy(serialport,optarg);
fd = serialport_init(optarg, baudrate);
if( fd==-1 ) error("couldn't open port");
serialport_flush(fd);
break;
case 'P':
strcpy(httpport,optarg);
break;
}
}
char *options[] = {"listening_ports", httpport, NULL};
//fd = serialport_init("/dev/tty.usbserial-A800f8ib", 19200);
fd = serialport_init( serialport, baudrate );
if( fd==-1 ) fprintf(stderr, "couldn't open port");
printf("opened serialport %s @ %d bps\n", serialport, baudrate);
ctx = mg_start(&callback, NULL, (const char**) options);
printf("arduino-serial-server: running on port %s\n",
mg_get_option(ctx, "listening_ports"));
getchar(); // Wait until user hits "enter"
mg_stop(ctx);
return 0;
}
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