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# mqtt_set_tls_certificate

Sets the TLS private key file, certificate file, and the private key password.

## C Language

int mqtt_set_tls_certificate( MQTT handle, const char* certificatePath, const char* pkeyPath, const char* pkeyPassword);

Example | MQTT Vuser Functions

## Arguments

Name | Comments
--- | ---
handle | The MQTT client handle returned by mqtt_create.
certificatePath | The path of the certificate file. The path can be absolute or relative to the script directory.
pkeyPassword | The private key password. Pass MQTT_NONE if the private key is not encrypted.
pkeyPath | The path of the private key file. MQTT_NONE if certificate and private key are in the same file.

## General Information

mqtt_set_tls_certificate sets the TLS private key file, certificate file, and the private key password. The files must be in PEM format. Call this function before mqtt_connect.

If invalid arguments are passed, the Vuser aborts, even if Continue on error is set.

## Return Values

MQTT_SUCCESS or MQTT_FAIL

## Parameterization

Standard parameterization is available for this function.

Exception: pkeyPassword cannot be parametrized (to avoid exposing in the output log)

## Example

`MQTT client = mqtt_create();`

`/* Set TLS certificate for secured connection:`

`- client certificate file`

`- client private key file`

`- client private key password (encrypted in this case)`

`As file paths are relative, they are expected to be placed in the script directory and added as Extra Files`

`*/`

`mqtt_set_tls_certificate(client, "client.crt", "client.key", lr_unmask("582c4f507db5f3df86f88518"));`

`mqtt_connect(client, "ssl://test.broker.com:8883");`

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