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rref requestable via mqtt

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This commit is contained in:
damage 2024-01-24 22:08:06 +01:00
parent 0ac6418870
commit 8853b3306a
7 changed files with 178 additions and 43 deletions
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2
Makefile
View File

@ -6,7 +6,7 @@ command:
gcc -o ${BIN}/command network.c command.c
readref:
gcc -o ${BIN}/readref network.c mqtt.c -lmosquitto readref.c
gcc -o ${BIN}/readref network.c mqtt.c -lmosquitto readref.c -lm
.PHONY: clean dirs
clean:

22
mqtt.c
View File

@ -6,7 +6,7 @@
// https://mosquitto.org/api/files/mosquitto-h.html
#include <mosquitto.h>
struct mosquitto *connectMqtt(char *user, char *pass)
struct mosquitto *connectMqtt(char *user, char *pass, void (*messageCallback)(struct mosquitto *, void *, const struct mosquitto_message *))
{
int err;
struct mosquitto *mqtt;
@ -47,6 +47,8 @@ struct mosquitto *connectMqtt(char *user, char *pass)
return NULL;
}
mosquitto_message_callback_set(mqtt, messageCallback);
return mqtt;
}
@ -57,7 +59,22 @@ int sendMqtt(struct mosquitto *mqtt, char *topic, char *payload, int payloadLeng
err = mosquitto_publish(mqtt, NULL, topic, payloadLength, payload, 0, false);
if (err)
{
fprintf(stderr, "Error publishing message (%d): %s\n", err, mosquitto_strerror(err));
fprintf(stderr, "Error publishing message to %s (%d): %s\n", topic, err, mosquitto_strerror(err));
return -1;
}
else
{
return 0;
}
}
int recvMqtt(struct mosquitto *mqtt, char *topic)
{
int err;
err = mosquitto_subscribe(mqtt, NULL, topic, 0);
if (err) {
fprintf(stderr, "Error subscribing to %s (%d): %s", topic, err, mosquitto_strerror(err));
return -1;
}
else
@ -71,4 +88,5 @@ void disconnectMqtt(struct mosquitto *mqtt)
// ignore errors
mosquitto_disconnect(mqtt);
mosquitto_destroy(mqtt);
mosquitto_lib_cleanup();
}

3
mqtt.h
View File

@ -1,3 +1,4 @@
struct mosquitto * connectMqtt(char *user, char *pass);
struct mosquitto * connectMqtt(char *user, char *pass, void (*messageCallback)(struct mosquitto *, void *, const struct mosquitto_message *));
int sendMqtt(struct mosquitto *mqtt, char *topic, char *payload, int payloadLength);
int recvMqtt(struct mosquitto *mqtt, char *topic);
void disconnectMqtt(struct mosquitto *mqtt);

20
network.c
View File

@ -48,7 +48,7 @@ int sendToXPlane(int sock, char *destAddr, int destPort, char *msg, void *payloa
}
else
{
fprintf(stderr, "Failed to send message (%d): %s", errno, strerror(errno));
fprintf(stderr, "Failed to send message (%d): %s\n", errno, strerror(errno));
return -1;
}
}
@ -57,7 +57,10 @@ int recvFromXPlane(int sock, char msg[DGRAM_MSG_LENGTH], void *payload, int maxL
{
char buf[maxLength + DGRAM_MSG_LENGTH];
memset(buf, 0, sizeof(buf));
int recvBytes = recv(sock, buf, maxLength + DGRAM_MSG_LENGTH, 0);
strcpy(msg, "");
int recvBytes = recv(sock, buf, maxLength + DGRAM_MSG_LENGTH, MSG_DONTWAIT);
if (recvBytes >= 0)
{
if (recvBytes >= DGRAM_MSG_LENGTH)
@ -68,14 +71,21 @@ int recvFromXPlane(int sock, char msg[DGRAM_MSG_LENGTH], void *payload, int maxL
}
else
{
fprintf(stderr, "Received data without message header?!");
fprintf(stderr, "Received data without message header?!\n");
return -11;
}
}
else
{
fprintf(stderr, "Error receiving data (%d): %s", errno, strerror(errno));
return -1;
if (errno != EAGAIN)
{
fprintf(stderr, "Error receiving data (%d): %s\n", errno, strerror(errno));
return -1;
}
else
{
return 0;
}
}
}

127
readref.c
View File

@ -2,17 +2,34 @@
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <math.h>
#include <mosquitto.h>
#include "network.h"
#include "mqtt.h"
#include "config.h"
#define MQTT_RREF_REQUEST_LENGTH_ID 3
#define MQTT_RREF_REQUEST_LENGTH_FREQ 3
#define MQTT_RREF_REQUEST_LENGTH_SEPARATOR 1
#define MQTT_RREF_REQUEST_SEPARATOR ' '
const int MQTT_RREF_REQUEST_START_ID = 0;
const int MQTT_RREF_REQUEST_START_FREQ = MQTT_RREF_REQUEST_START_ID + MQTT_RREF_REQUEST_LENGTH_ID + MQTT_RREF_REQUEST_LENGTH_SEPARATOR;
const int MQTT_RREF_REQUEST_START_RREF = MQTT_RREF_REQUEST_START_FREQ + MQTT_RREF_REQUEST_LENGTH_FREQ + MQTT_RREF_REQUEST_LENGTH_SEPARATOR;
const int MQTT_RREF_REQUEST_MIN_LENGTH = MQTT_RREF_REQUEST_LENGTH_ID + MQTT_RREF_REQUEST_LENGTH_FREQ + (2 * MQTT_RREF_REQUEST_LENGTH_SEPARATOR) + 1; // at least one char for rref
int xPlaneSocket;
struct mosquitto *mqtt;
#define XPLANE_RREF_MAX_LENGTH 400
struct dref_struct_in
{
int32_t dref_freq;
int32_t dref_sender_index; // the index the customer is using to define this dataref
char dref_string[400];
char dref_string[XPLANE_RREF_MAX_LENGTH];
};
struct dref_struct_out
@ -21,19 +38,70 @@ struct dref_struct_out
float dref_flt_value;
};
int main(int argc, char *argv[])
int *strtoint(char *in, size_t start, size_t n)
{
int xPlaneSocket;
struct mosquitto *mqtt;
char *wtf;
int *ret = malloc(sizeof(int));
*ret = 0;
int offset = start + n - 1;
// check argument
if (argc != 1 && (argc - 1) % 3 != 0)
if (offset < 0)
{
fprintf(stderr, "Usage: %s [<dataref> <frequency> <id> [<dataref> <frequency> <id> ... ]]\n", argv[0]);
exit(EXIT_FAILURE);
return NULL;
}
for (int i = 0; i < n; i++) {
int position = offset - i;
if (in[position] >= '0' && in[position] <= '9')
{
*ret += (in[position] - '0') * pow(10, i);
}
else
{
return NULL;
}
}
return ret;
}
void onMessage(struct mosquitto *mqtt, void *obj, const struct mosquitto_message *message)
{
int *id, *frequency;
char rref[XPLANE_RREF_MAX_LENGTH];
printf("Received message %.*s on topic %s\n", message->payloadlen, (char *)message->payload, message->topic);
if (strcmp(message->topic, "/xplane/meta/rref") == 0)
{
printf("found rref request\n");
if (message->payloadlen >= MQTT_RREF_REQUEST_MIN_LENGTH)
{
id = strtoint(message->payload, MQTT_RREF_REQUEST_START_ID, MQTT_RREF_REQUEST_LENGTH_ID);
frequency = strtoint(message->payload, MQTT_RREF_REQUEST_START_FREQ, MQTT_RREF_REQUEST_LENGTH_FREQ);
if (id == NULL || frequency == NULL) {
return;
}
// prepare struct to send, make sure padding is with NULL bytes
struct dref_struct_in drefToRead = {
.dref_freq = *frequency,
.dref_sender_index = *id
};
memset(drefToRead.dref_string, 0, sizeof(drefToRead.dref_string));
strncpy(drefToRead.dref_string, &((char *)message->payload)[MQTT_RREF_REQUEST_START_RREF], message->payloadlen - MQTT_RREF_REQUEST_START_RREF);
sendToXPlane(xPlaneSocket, DEST_SERVER, DEST_PORT, "RREF", (char *)&drefToRead, sizeof(drefToRead));
}
}
else
{
fprintf(stderr, "Unkown topic %s\n", message->topic);
}
}
int main()
{
// network
xPlaneSocket = createSocket(SRC_PORT);
if (xPlaneSocket < 0)
@ -42,25 +110,15 @@ int main(int argc, char *argv[])
}
// mqtt
mqtt = connectMqtt(MQTT_USER, MQTT_PASS);
// request every dref from arguments
for (int i = 1; i < argc; i = i + 3)
mqtt = connectMqtt(MQTT_USER, MQTT_PASS, onMessage);
if (mqtt == NULL)
{
// prepare struct to send, make sure padding is with NULL bytes
struct dref_struct_in drefToRead = {
.dref_freq = strtoimax(argv[i + 1], &wtf, 10),
.dref_sender_index = strtoimax(argv[i + 2], &wtf, 10)};
memset(drefToRead.dref_string, 0, sizeof(drefToRead.dref_string));
strcpy(drefToRead.dref_string, argv[i]);
// send payload
if (sendToXPlane(xPlaneSocket, DEST_SERVER, DEST_PORT, "RREF", (char *)&drefToRead, sizeof(drefToRead)) < 0)
{
exit(EXIT_FAILURE);
}
exit(EXIT_FAILURE);
}
// subscribe meta channel
recvMqtt(mqtt, "/xplane/meta/#");
// read from network
char msg[DGRAM_MSG_LENGTH + 1];
char payload[RECV_BUFFER];
@ -69,17 +127,18 @@ int main(int argc, char *argv[])
while (1)
{
int payloadBytes = recvFromXPlane(xPlaneSocket, msg, payload, RECV_BUFFER);
if (payloadBytes > 0)
if (payloadBytes >= 0)
{
printf("Received message type %s\n", msg);
printf("Received message data (%d) ", payloadBytes);
for (int i = 0; i < payloadBytes; i++)
{
printf("%02x", payload[i]);
}
printf("\n");
if (strcmp(msg, "RREF") == 0)
{
printf("Received message type %s\n", msg);
printf("Received message data (%d) ", payloadBytes);
for (int i = 0; i < payloadBytes; i++)
{
printf("%02x", payload[i]);
}
printf("\n");
// XXX: loop throught multiple drefs
if ((payloadBytes - 1) % 8 == 0)
{
@ -110,6 +169,8 @@ int main(int argc, char *argv[])
{
exit(EXIT_FAILURE);
}
mosquitto_loop(mqtt, 100, 1);
}
// bye bye (and no, I don't care about error anymore; I'll exit anyway?!)

3
test/.gitignore vendored
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@ -1,4 +1,5 @@
airspeed
heading
mqtt
mqtt.h
mqtt.h
strtoint

44
test/strtoint.c Normal file
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@ -0,0 +1,44 @@
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
int *strtoint(char *in, size_t start, size_t n)
{
int *ret = malloc(sizeof(int));
*ret = 0;
int offset = start + n - 1;
if (offset < 0)
{
return NULL;
}
for (int i = 0; i < n; i++) {
int position = offset - i;
printf("foo: %c\n", in[position]);
if (in[position] >= '0' && in[position] <= '9')
{
*ret += (in[position] - '0') * pow(10, i);
}
else
{
return NULL;
}
}
return ret;
}
int main()
{
char *in = "abcd123";
int *ret = strtoint(in, 4, 3);
if (ret != NULL)
{
printf("%s | %d\n", in, *ret);
}
else
{
printf("ret is NULL\n");
}
}