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All API functions in μC/MQTT-client include code to validate arguments that are passed to it. Specifically, μC/MQTT-client checks to see if passed pointers are NULL, if arguments are within valid ranges, etc. The following constant configures additional argument checking.
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| title | Table - MQTTc Argument Checking Configuration |
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| Constant | Description | Possible Values |
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MQTTc_CFG_ARG_CHK_EXT_EN | Includes generated code to check arguments for functions that can be called by the user as well as internal functions which receive arguments from an API that the user can call. | DEF_ENABLED or DEF_DISABLED |
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Debug Configuration
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| title | Table - MQTTc Debug Configurations |
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| Constant | Description | Possible Values |
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MQTTc_CFG_DBG_TRACE_LEVEL | Trace level to use throughout the MQTTc stack. | TRACE_LEVEL_OFF (no trace)
TRACE_LEVEL_INFO (some traces)
TRACE_LEVEL_DBG (many traces)
| MQTTc_CFG_DBG_TRACE | Function used to output the MQTTc trace. | printf | MQTTc_CFG_DBG_GLOBAL_BUF_EN | Enable/disable the debugging buffer feature, that copies some MQTT messages at interesting points for further analysis. | DEF_ENABLED or DEF_DISABLED | MQTTc_CFG_DBG_GLOBAL_BUF_LEN | Length, in bytes, of the debug buffer. | Any numeric value. 512u, by default. |
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