How to publish asynchronously with HiRedis - c++

Question

I am using HiRedis with a c/c++ program and have written some tests to verify that subscriptions work (I based my solution on this comment).
However, currently I can only publish by manually typing something like publish foo "abcd" into the redis-cli terminal. This works as per the linked comment, but I'd like to publish from my c++ program. How can I do this?
I have tried this command:
redisAsyncCommand(c, SubCallback, (char*)"command", "publish foo \"abcd\"");
But that results in this runtime error:
Error: ERR only (P)SUBSCRIBE / (P)UNSUBSCRIBE / QUIT allowed in this context
How can I publish data from within HiRedis?

Answer 1

Once a connection context has subscribed, it can't be used to PUBLISH. You must create a new connection.

Answer 2

from https://github.com/redis/hiredis in hiredis/examples/example-libevent.c:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <hiredis.h>
#include <async.h>
#include <adapters/libevent.h>
void getCallback(redisAsyncContext *c, void *r, void *privdata) {
redisReply *reply = r;
if (reply == NULL) return;
printf("argv[%s]: %s\n", (char*)privdata, reply->str);
/* Disconnect after receiving the reply to GET */
redisAsyncDisconnect(c);
}
void connectCallback(const redisAsyncContext *c, int status) {
if (status != REDIS_OK) {
printf("Error: %s\n", c->errstr);
return;
}
printf("Connected...\n");
}
void disconnectCallback(const redisAsyncContext *c, int status) {
if (status != REDIS_OK) {
printf("Error: %s\n", c->errstr);
return;
}
printf("Disconnected...\n");
}
int main (int argc, char **argv) {
signal(SIGPIPE, SIG_IGN);
struct event_base *base = event_base_new();
redisAsyncContext *c = redisAsyncConnect("127.0.0.1", 6379);
if (c->err) {
/* Let *c leak for now... */
printf("Error: %s\n", c->errstr);
return 1;
}
redisLibeventAttach(c,base);
redisAsyncSetConnectCallback(c,connectCallback);
redisAsyncSetDisconnectCallback(c,disconnectCallback);
redisAsyncCommand(c, NULL, NULL, "SET key %b", argv[argc-1], strlen(argv[argc-1]));
redisAsyncCommand(c, getCallback, (char*)"end-1", "GET key");
event_base_dispatch(base);
return 0;
}