net/mqttsn: add min&max allowed len for client ID

RIOT-OS · Jul 4, 2019 · 16fa111 · 16fa111
1 parent 59933d2
commit 16fa111
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/sys/include/net/mqttsn.h b/sys/include/net/mqttsn.h
@@ -35,6 +35,16 @@ extern "C" {
 #define MQTTSN_DEFAULT_PORT     (1883U)
 #endif
 
+/**
+ * @name    The client ID must contain 1-23 characters
+ *
+ * @see MQTT-SN spec v1.2, section 5.3.1
+ * @{
+ */
+#define MQTTSN_CLI_ID_MINLEN    (1U)
+#define MQTTSN_CLI_ID_MAXLEN    (23U)
+/** @} */
+
 /**
  * @brief   MQTT-SN flags
  *