Fix `mosquitto_pub -l` quitting if broker unavailable.

This could occur when a message publication is attempted when the broker
is temporarily unavailable.

Closes #2187. Thanks to JsBergbau.

ChangeLog.txt

@@ -9,6 +9,8 @@ Broker:
 Clients:
 - If sending mosquitto_sub output to a pipe, mosquitto_sub will now detect
   that the pipe has closed and disconnect. Closes #2164.
+- Fix `mosquitto_pub -l` quitting if a message publication is attempted when
+  the broker is temporarily unavailable. Closes #2187.
 
 
 2.0.10 - 2021-04-03

client/pub_client.c

@@ -268,9 +268,8 @@ static int pub_stdin_line_loop(struct mosquitto *mosq)
 					line_buf[buf_len_actual-1] = '\0';
 					rc = my_publish(mosq, &mid_sent, cfg.topic, buf_len_actual-1, line_buf, cfg.qos, cfg.retain);
 					pos = 0;
-					if(rc){
-						err_printf(&cfg, "Error: Publish returned %d.\n", rc);
-						if(cfg.qos>0) return rc;
+					if(rc != MOSQ_ERR_SUCCESS && rc != MOSQ_ERR_NO_CONN){
+						return rc;
 					}
 					break;
 				}else{
@@ -288,7 +287,6 @@ static int pub_stdin_line_loop(struct mosquitto *mosq)
 			if(pos != 0){
 				rc = my_publish(mosq, &mid_sent, cfg.topic, buf_len_actual, line_buf, cfg.qos, cfg.retain);
 				if(rc){
-					err_printf(&cfg, "Error: Publish returned %d.\n", rc);
 					if(cfg.qos>0) return rc;
 				}
 			}
@@ -357,7 +355,7 @@ static int pub_other_loop(struct mosquitto *mosq)
 					rc = my_publish(mosq, &mid_sent, cfg.topic, 0, NULL, cfg.qos, cfg.retain);
 					break;
 			}
-			if(rc){
+			if(rc != MOSQ_ERR_SUCCESS && rc != MOSQ_ERR_NO_CONN){
 				err_printf(&cfg, "Error sending repeat publish: %s", mosquitto_strerror(rc));
 			}
 		}