[lwip-devel] [bug #52332] MQTT_OUTPUT_RINGBUF_SIZE must be a power of 2

[David Bourgeois]

URL:
  <http://savannah.nongnu.org/bugs/?52332>

                 Summary: MQTT_OUTPUT_RINGBUF_SIZE must be a power of 2 
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: jaguarondi
            Submitted on: Thu 02 Nov 2017 11:29:24 PM UTC
                Category: apps
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: git head

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Details:

As MQTT_OUTPUT_RINGBUF_SIZE is used as a mask in the ring buffer, it must be a
power of 2. Could we add that information in the documentation field?

/**
 * Output ring-buffer size, must be a power of 2 (128, 256, 512, etc.) and
must be able to fit largest outgoing publish message topic+payloads
 */
#ifndef MQTT_OUTPUT_RINGBUF_SIZE
#define MQTT_OUTPUT_RINGBUF_SIZE 256
#endif




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