mbc_master_send_request() function

Send data request as defined in parameter request, waits response from slave and returns status of command execution. This function provides standard way for read/write access to Modbus devices in the network.

Syntax

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Summary

Declaration

Definition

from esp_modbus_master.h:259

esp_err_t mbc_master_send_request(mb_param_request_t* request, void* data_ptr);

Implemented in esp_modbus_master.c:85

Arguments

Argument

Description

request

pointer to request structure of type mb_param_request_t

data_ptr

pointer to data buffer to send or received data (dependent of command field in request)

Return value

- esp_err_t ESP_OK - request was successful - esp_err_t ESP_ERR_INVALID_ARG - invalid argument of function - esp_err_t ESP_ERR_INVALID_RESPONSE - an invalid response from slave - esp_err_t ESP_ERR_TIMEOUT - operation timeout or no response from slave - esp_err_t ESP_ERR_NOT_SUPPORTED - the request command is not supported by slave - esp_err_t ESP_FAIL - slave returned an exception or other failure

Examples

References

from examples

mbc_master_send_request() function

Syntax

Arguments

Return value

Examples

References

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