mqtt port config changes

1. update example shairport-sync.conf file
2. update config file mqtt port parsing

Signed-off-by: David Crook <idcrook@users.noreply.github.com>

2 files changed, 9 insertions, 8 deletions

diff --git a/scripts/shairport-sync.conf b/scripts/shairport-sync.conf
index 7b030d6..cd342d8 100644
--- a/scripts/shairport-sync.conf
+++ b/scripts/shairport-sync.conf
@@ -31,7 +31,7 @@ general =
 //	volume_control_profile = "standard" ; // use this advanced setting to specify how the airplay volume is transferred to the mixer volume.
 //		"standard" makes the volume change more quickly at lower volumes and slower at higher volumes.
 //		"flat" makes the volume change at the same rate at all volumes.
-//	volume_range_combined_hardware_priority = "no"; // when extending the volume range by combining the built-in software attenuator with the hardware mixer attenuator, set this to "yes" to reduce volume by using the hardware mixer first, then the built-in software attenuator. 
+//	volume_range_combined_hardware_priority = "no"; // when extending the volume range by combining the built-in software attenuator with the hardware mixer attenuator, set this to "yes" to reduce volume by using the hardware mixer first, then the built-in software attenuator.
 //	run_this_when_volume_is_set = "/full/path/to/application/and/args"; //	Run the specified application whenever the volume control is set or changed.
 //		The desired AirPlay volume is appended to the end of the command line – leave a space if you want it treated as an extra argument.
 //		AirPlay volume goes from 0 to -30 and -144 means "mute".
@@ -199,7 +199,7 @@ mqtt =
 {
 //	enabled = "no"; // set this to yes to enable the mqtt-metadata-service
 //	hostname = "iot.eclipse.org"; // Hostname of the MQTT Broker
-//	port = "1883";
+//	port = 1883; // Port on the MQTT Broker to connect to
 //	username = NULL; //set this to a string with your username, to enable username authentication
 //	password = NULL; //set this to a string with your password, to enable username & password authentication
 //	capath = NULL; //set this to the folder with the CA-Certificates to be accepted for the server certificate. If not set, TLS is not used
diff --git a/shairport.c b/shairport.c
index 9e9400b..667a565 100644
--- a/shairport.c
+++ b/shairport.c
@@ -992,7 +992,6 @@ int parse_options(int argc, char **argv) {
 #endif
 
 #ifdef CONFIG_MQTT
-    int tmpval = 0;
     config_set_lookup_bool(config.cfg, "mqtt.enabled", &config.mqtt_enabled);
     if (config.mqtt_enabled && !config.metadata_enabled) {
       die("You need to have metadata enabled in order to use mqtt");
@@ -1001,11 +1000,13 @@ int parse_options(int argc, char **argv) {
       config.mqtt_hostname = (char *)str;
       // TODO: Document that, if this is false, whole mqtt func is disabled
     }
-    if (config_lookup_int(config.cfg, "mqtt.port", &tmpval)) {
-      config.mqtt_port = tmpval;
-    } else {
-      // TODO: Is this the correct way to set a default value?
-      config.mqtt_port = 1883;
+    config.mqtt_port = 1883;
+    if (config_lookup_int(config.cfg, "mqtt.port", &value)) {
+      if ((value < 0) || (value > 65535))
+          die("Invalid mqtt port number  \"%sd\". It should be between 0 and 65535, default is 1883",
+              value);
+      else
+          config.mqtt_port = value;
     }
 
     if (config_lookup_string(config.cfg, "mqtt.username", &str)) {