Configuration

This is the default configuration of the middleware. When any of the settings shall be modified, it shall be done in dedicated application config lwesp_opts.h file.

Note

Check Getting started for guidelines on how to create and use configuration file.

group LWESP_OPT

ESP-AT options.

Defines

LWESP_CFG_ESP8266

Enables 1 or disables 0 support for ESP8266 AT commands.

LWESP_CFG_ESP32

Enables 1 or disables 0 support for ESP32 AT commands.

LWESP_CFG_OS

Enables 1 or disables 0 operating system support for ESP library.

Note

Value must be set to 1 in the current revision

Note

Check OS configuration group for more configuration related to operating system

LWESP_CFG_MEM_CUSTOM

Enables 1 or disables 0 custom memory management functions.

When set to 1, Memory manager block must be provided manually. This includes implementation of functions lwesp_mem_malloc, lwesp_mem_calloc, lwesp_mem_realloc and lwesp_mem_free

Note

Function declaration follows standard C functions malloc, calloc, realloc, free. Declaration is available in lwesp/lwesp_mem.h file. Include this file to final implementation file

Note

When implementing custom memory allocation, it is necessary to take care of multiple threads accessing same resource for custom allocator

LWESP_CFG_MEM_ALIGNMENT

Memory alignment for dynamic memory allocations.

Note

Some CPUs can work faster if memory is aligned, usually to 4 or 8 bytes. To speed up this possibilities, you can set memory alignment and library will try to allocate memory on aligned boundaries.

Note

Some CPUs such ARM Cortex-M0 dont’t support unaligned memory access.

Note

This value must be power of 2

LWESP_CFG_USE_API_FUNC_EVT

Enables 1 or disables 0 callback function and custom parameter for API functions.

When enabled, 2 additional parameters are available in API functions. When command is executed, callback function with its parameter could be called when not set to NULL.

LWESP_CFG_MAX_CONNS

Maximal number of connections AT software can support on ESP device.

Note

In case of official AT software, leave this on default value (5)

LWESP_CFG_CONN_MAX_DATA_LEN

Maximal number of bytes we can send at single command to ESP.

When manual TCP read mode is enabled, this parameter defines number of bytes to be read at a time

Note

Value can not exceed 2048 bytes or no data will be send at all (ESP8266 AT SW limitation)

Note

This is limitation of ESP AT commands and on systems where RAM is not an issue, it should be set to maximal value (2048) to optimize data transfer speed performance

LWESP_CFG_MAX_SEND_RETRIES

Set number of retries for send data command.

Sometimes it may happen that AT+SEND command fails due to different problems. Trying to send the same data multiple times can raise chances for success.

LWESP_CFG_CONN_MAX_RECV_BUFF_SIZE

Maximum single buffer size for network receive data on active connection.

Note

When ESP sends buffer bigger than maximal, multiple buffers are created

LWESP_CFG_AT_PORT_BAUDRATE

Default baudrate used for AT port.

Note

User may call API function to change to desired baudrate if necessary

LWESP_CFG_MODE_STATION

Enables 1 or disables 0 ESP acting as station.

Note

When device is in station mode, it can connect to other access points

LWESP_CFG_MODE_ACCESS_POINT

Enables 1 or disables 0 ESP acting as access point.

Note

When device is in access point mode, it can accept connections from other stations

LWESP_CFG_RCV_BUFF_SIZE

Buffer size for received data waiting to be processed.

Note

When server mode is active and a lot of connections are in queue this should be set high otherwise your buffer may overflow

Note

Buffer size also depends on TX user driver if it uses DMA or blocking mode. In case of DMA (CPU can work other tasks), buffer may be smaller as CPU will have more time to process all the incoming bytes

Note

This parameter has no meaning when LWESP_CFG_INPUT_USE_PROCESS is enabled

LWESP_CFG_RESET_ON_INIT

Enables 1 or disables 0 reset sequence after lwesp_init call.

Note

When this functionality is disabled, user must manually call lwesp_reset to send reset sequence to ESP device.

LWESP_CFG_RESTORE_ON_INIT

Enables 1 or disables 0 device restore after lwesp_init call.

Note

When this feature is enabled, it will automatically restore and clear any settings stored as default in ESP device

LWESP_CFG_RESET_ON_DEVICE_PRESENT

Enables 1 or disables 0 reset sequence after lwesp_device_set_present call.

Note

When this functionality is disabled, user must manually call lwesp_reset to send reset sequence to ESP device.

LWESP_CFG_RESET_DELAY_DEFAULT

Default delay (milliseconds unit) before sending first AT command on reset sequence.

LWESP_CFG_MAX_SSID_LENGTH

Maximum length of SSID for access point scan.

Note

This parameter must include trailling zero

LWESP_CFG_MAX_PWD_LENGTH

Maximum length of PWD for access point.

Note

This parameter must include trailling zero

LWESP_CFG_CONN_POLL_INTERVAL

Poll interval for connections in units of milliseconds.

Value indicates interval time to call poll event on active connections.

Note

Single poll interval applies for all connections

LWESP_CFG_CONN_MANUAL_TCP_RECEIVE

Enables 1 or disables 0 manual TCP data receive from ESP device.

Normally ESP automatically sends received TCP data to host device in async mode. When host device is slow or if there is memory constrain, it may happen that processing cannot handle all received data.

When feature is enabled, ESP will notify host device about new data available for read and then user may start read process

Note

This feature is only available for TCP connections.

LWESP_MIN_AT_VERSION_MAJOR_ESP8266

Minimal major version for ESP8266

LWESP_MIN_AT_VERSION_MINOR_ESP8266

Minimal minor version for ESP8266

LWESP_MIN_AT_VERSION_PATCH_ESP8266

Minimal patch version for ESP8266

LWESP_MIN_AT_VERSION_MAJOR_ESP32

Minimal major version for ESP32

LWESP_MIN_AT_VERSION_MINOR_ESP32

Minimal minor version for ESP32

LWESP_MIN_AT_VERSION_PATCH_ESP32

Minimal patch version for ESP32

group LWESP_OPT_DBG

Debugging configurations.

Defines

LWESP_CFG_DBG

Set global debug support.

Possible values are LWESP_DBG_ON or LWESP_DBG_OFF

Note

Set to LWESP_DBG_OFF to globally disable all debugs

LWESP_CFG_DBG_OUT(fmt, ...)

Debugging output function.

Called with format and optional parameters for printf-like debug

LWESP_CFG_DBG_LVL_MIN

Minimal debug level.

Check LWESP_DBG_LVL for possible values

LWESP_CFG_DBG_TYPES_ON

Enabled debug types.

When debug is globally enabled with LWESP_CFG_DBG parameter, user must enable debug types such as TRACE or STATE messages.

Check LWESP_DBG_TYPE for possible options. Separate values with bitwise OR operator

LWESP_CFG_DBG_INIT

Set debug level for init function.

Possible values are LWESP_DBG_ON or LWESP_DBG_OFF

LWESP_CFG_DBG_MEM

Set debug level for memory manager.

Possible values are LWESP_DBG_ON or LWESP_DBG_OFF

LWESP_CFG_DBG_INPUT

Set debug level for input module.

Possible values are LWESP_DBG_ON or LWESP_DBG_OFF

LWESP_CFG_DBG_THREAD

Set debug level for ESP threads.

Possible values are LWESP_DBG_ON or LWESP_DBG_OFF

LWESP_CFG_DBG_ASSERT

Set debug level for asserting of input variables.

Possible values are LWESP_DBG_ON or LWESP_DBG_OFF

LWESP_CFG_DBG_IPD

Set debug level for incoming data received from device.

Possible values are LWESP_DBG_ON or LWESP_DBG_OFF

LWESP_CFG_DBG_NETCONN

Set debug level for netconn sequential API.

Possible values are LWESP_DBG_ON or LWESP_DBG_OFF

LWESP_CFG_DBG_PBUF

Set debug level for packet buffer manager.

Possible values are LWESP_DBG_ON or LWESP_DBG_OFF

LWESP_CFG_DBG_CONN

Set debug level for connections.

Possible values are LWESP_DBG_ON or LWESP_DBG_OFF

LWESP_CFG_DBG_VAR

Set debug level for dynamic variable allocations.

Possible values are LWESP_DBG_ON or LWESP_DBG_OFF

LWESP_CFG_AT_ECHO

Enables 1 or disables 0 echo mode on AT commands sent to ESP device.

Note

This mode is useful when debugging ESP communication

group LWESP_OPT_OS

Operating system dependant configuration.

Defines

LWESP_CFG_THREAD_PRODUCER_MBOX_SIZE

Set number of message queue entries for procuder thread.

Message queue is used for storing memory address to command data

LWESP_CFG_THREAD_PROCESS_MBOX_SIZE

Set number of message queue entries for processing thread.

Message queue is used to notify processing thread about new received data on AT port

LWESP_CFG_INPUT_USE_PROCESS

Enables 1 or disables 0 direct support for processing input data.

When this mode is enabled, no overhead is included for copying data to receive buffer because bytes are processed directly by lwesp_input_process function

If this mode is not enabled, then user have to send every received byte via lwesp_input function to the internal buffer for future processing. This may introduce additional overhead with data copy and may decrease library performance

Note

This mode can only be used when LWESP_CFG_OS is enabled

Note

When using this mode, separate thread must be dedicated only for reading data on AT port. It is usually implemented in LL driver

Note

Best case for using this mode is if DMA receive is supported by host device

LWESP_THREAD_PRODUCER_HOOK()

Producer thread hook, called each time thread wakes-up and does the processing.

It can be used to check if thread is alive.

LWESP_THREAD_PROCESS_HOOK()

Process thread hook, called each time thread wakes-up and does the processing.

It can be used to check if thread is alive.

group LWESP_OPT_STD_LIB

Standard C library configuration.

Configuration allows you to overwrite default C language function in case of better implementation with hardware (for example DMA for data copy).

Defines

LWESP_MEMCPY(dst, src, len)

Memory copy function declaration.

User is able to change the memory function, in case hardware supports copy operation, it may implement its own

Function prototype must be similar to:

void *  my_memcpy(void* dst, const void* src, size_t len);

Return

Destination memory start address

Parameters

• [in] dst: Destination memory start address

• [in] src: Source memory start address

• [in] len: Number of bytes to copy

LWESP_MEMSET(dst, b, len)

Memory set function declaration.

Function prototype must be similar to:

void *  my_memset(void* dst, int b, size_t len);

Return

Destination memory start address

Parameters

• [in] dst: Destination memory start address

• [in] b: Value (byte) to set in memory

• [in] len: Number of bytes to set

group LWESP_OPT_MODULES

Configuration of specific modules.

Defines

LWESP_CFG_DNS

Enables 1 or disables 0 support for DNS functions.

LWESP_CFG_WPS

Enables 1 or disables 0 support for WPS functions.

LWESP_CFG_SNTP

Enables 1 or disables 0 support for SNTP protocol with AT commands.

LWESP_CFG_HOSTNAME

Enables 1 or disables 0 support for hostname with AT commands.

LWESP_CFG_PING

Enables 1 or disables 0 support for ping functions.

LWESP_CFG_MDNS

Enables 1 or disables 0 support for mDNS.

LWESP_CFG_SMART

Enables 1 or disables 0 support for SMART config.

group LWESP_OPT_MODULES_NETCONN

Configuration of netconn API module.

Defines

LWESP_CFG_NETCONN

Enables 1 or disables 0 NETCONN sequential API support for OS systems.

Note

To use this feature, OS support is mandatory.

See

LWESP_CFG_OS

LWESP_CFG_NETCONN_RECEIVE_TIMEOUT

Enables 1 or disables 0 receive timeout feature.

When this option is enabled, user will get an option to set timeout value for receive data on netconn, before function returns timeout error.

Note

Even if this option is enabled, user must still manually set timeout, by default time will be set to 0 which means no timeout.

LWESP_CFG_NETCONN_ACCEPT_QUEUE_LEN

Accept queue length for new client when netconn server is used.

Defines number of maximal clients waiting in accept queue of server connection

LWESP_CFG_NETCONN_RECEIVE_QUEUE_LEN

Receive queue length for pbuf entries.

Defines maximal number of pbuf data packet references for receive

group LWESP_OPT_MODULES_MQTT

Configuration of MQTT and MQTT API client modules.

Defines

LWESP_CFG_MQTT_MAX_REQUESTS

Maximal number of open MQTT requests at a time.

LWESP_CFG_DBG_MQTT

Set debug level for MQTT client module.

Possible values are LWESP_DBG_ON or LWESP_DBG_OFF

LWESP_CFG_DBG_MQTT_API

Set debug level for MQTT API client module.

Possible values are LWESP_DBG_ON or LWESP_DBG_OFF

group LWESP_OPT_MODULES_CAYENNE

Configuration of Cayenne MQTT client.

Defines

LWESP_CFG_DBG_CAYENNE

Set debug level for Cayenne MQTT client module.

Possible values are LWESP_DBG_ON or LWESP_DBG_OFF

group LWESP_OPT_APP_HTTP

Configuration of HTTP server app.

Defines

LWESP_CFG_DBG_SERVER

Server debug default setting.

HTTP_SSI_TAG_START

SSI tag start string

HTTP_SSI_TAG_START_LEN

SSI tag start length

HTTP_SSI_TAG_END

SSI tag end string

HTTP_SSI_TAG_END_LEN

SSI tag end length

HTTP_SSI_TAG_MAX_LEN

Maximal length of tag name excluding start and end parts of tag.

HTTP_SUPPORT_POST

Enables 1 or disables 0 support for POST request.

HTTP_MAX_URI_LEN

Maximal length of allowed uri length including parameters in format /uri/sub/path?param=value

HTTP_MAX_PARAMS

Maximal number of parameters in URI.

HTTP_USE_METHOD_NOTALLOWED_RESP

Enables 1 or disables 0 method not allowed response.

Response is used in case user makes HTTP request with method which is not on the list of allowed methods. See http_req_method_t

Note

When disabled, connection will be closed without response

HTTP_USE_DEFAULT_STATIC_FILES

Enables 1 or disables 1 default static files.

To allow fast startup of server development, several static files are included by default:

• /index.html

• /index.shtml

• /js/style.css

• /js/js.js

HTTP_DYNAMIC_HEADERS

Enables 1 or disables 0 dynamic headers support.

With dynamic headers enabled, script will try to detect most common file extensions and will try to response with:

• HTTP response code as first line

• Server name as second line

• Content type as third line including end of headers (empty line)

HTTP_DYNAMIC_HEADERS_CONTENT_LEN

Enables 1 or disables 0 content length header for response.

If response has fixed length without SSI tags, dynamic headers will try to include “Content-Length” header as part of response message sent to client

Note

In order to use this, HTTP_DYNAMIC_HEADERS must be enabled

HTTP_SERVER_NAME

Default server name for Server: x response dynamic header.