20 lines
977 B
Markdown
20 lines
977 B
Markdown
# Limitations and known issues
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* When the CleanSession is set to `false`, the implementation is not spec compliant. 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 failure.
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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 use of esp8266/Arduino 2.4.0, which is not yet released (platform = espressif8266_stage in PlatformIO).
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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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