DOC: config: Explictly add supported MQTT versions

This avoids any ambiguities on supported versions. This patch depends on
129579813 ("MEDIUM: mqtt: support mqtt_is_valid and mqtt_field_value
converters for MQTTv3.1").

It must be backported with the above commit.

diff --git a/doc/configuration.txt b/doc/configuration.txt
index 4a27f8ab5d49a5ae6197d74ace9e00f2fa9a9847..e75d84b1758be892feaf9260330b091ff8bdeca4 100644 (file)
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -16976,6 +16976,8 @@ mqtt_is_valid
   CONNECT and CONNACK packet types. CONNECT is the first message sent by the
   client and CONNACK is the first response sent by the server.
 
+  Only MQTT 3.1, 3.1.1 and 5.0 are supported.
+
   Example:
 
       acl data_in_buffer req.len ge 4