diff -r 70c99c2084dc -r e52d11b8f252 main/task_mqtt.c
--- a/main/task_mqtt.c	Tue Nov 26 11:55:46 2019 +0100
+++ b/main/task_mqtt.c	Fri Nov 29 14:26:37 2019 +0100
@@ -54,6 +54,10 @@
 
 
 
+/**
+ * @brief Generate the mqtt payload header.
+ * @return Allocated character string with the header.
+ */
 char *payload_header(void)
 {
     char        *tmp, buf[128];
@@ -71,6 +75,11 @@
 
 
 
+/**
+ * @brief Generate the mqtt topic base part.
+ * @param msgtype The message type part of the topic.
+ * @return The topic string allocated in memory.
+ */
 char *topic_base(char *msgtype)
 {
     char        *tmp;
@@ -84,6 +93,11 @@
 
 
 
+/**
+ * @brief The mqtt generic publish function.
+ * @param topic The topic of the mqtt message.
+ * @param payload The payload of the mqtt message.
+ */
 void publisher(char *topic, char *payload)
 {
     /*
@@ -104,6 +118,11 @@
 
 
 
+/**
+ * @brief Generate json data for the given unit.
+ * @param i The unit record number.
+ * @return The json string allocated in memory.
+ */
 char *unit_data(int i)
 {
     char	*payload = NULL;