20 lines
961 B
Markdown
20 lines
961 B
Markdown
# Limitations and known issues
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* The library is spec compliant with one limitation. In case of power loss the following is not honored:
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> Must be kept in memory:
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* All messages in a QoS 1 or 2 flow, which are not confirmed by the broker
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* All received QoS 2 messages, which are not yet confirmed to the broker
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This means retransmission is not honored in case of a power failure. This behaviour is like explained in point 4.1.1 of the MQTT specification v3.1.1
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* You cannot send payload larger that what can fit on RAM.
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## SSL limitations
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* SSL requires the build flag -DASYNC_TCP_SSL_ENABLED=1
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* SSL only supports fingerprints for server validation.
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* If you do not specify one or more acceptable server fingerprints, the SSL connection will be vulnerable to man-in-the-middle attacks.
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* Some server certificate signature algorithms do not work. SHA1, SHA224, SHA256, and MD5 are working. SHA384, and SHA512 will cause a crash.
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* TLS1.2 is not supported.
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