ST_IotMqttTLS

TLS security setting for the MQTT client.

Either CA (certificate authority) or PSK (PreSharedKey) can be used.

Syntax

Definition:

TYPE ST_IotMqttTls :
STRUCT
    sCA                : STRING(255); // certificate authority as filename (PEM or DER format) or as string (PEM)
    sCAPath            : STRING(255); // for future use
    sCert              : STRING(255); // client certificate as filename (PEM or DER format) or as string (PEM)
    sKeyFile           : STRING(255);
    sKeyPwd            : STRING(255);
    sCrl               : STRING(255); // Certificate Revocation List as filename (PEM or DER format) or as string (PEM)
    sCiphers           : STRING(255);
    sVersion           : STRING(80) := 'tlsv1.2'; // TLS version
    bNoServerCertCheck : BOOL := FALSE;

    sPskIdentity       : STRING(255);
    aPskKey            : ARRAY[1..64] OF BYTE;
    nPskKeyLen         : USINT;

    sAzureSas          : STRING(511);
END_STRUCT
END_TYPE

Parameters

Name

Type

Description

sCA

STRING(255)

Certificate of the certificate authority (CA)

sCert

STRING(255)

Client certificate to be used for authentication at the broker

sKeyFile

STRING(255)

Private key of the client

sKeyPwd

STRING(255)

Password of the private key, if applicable

sCrl

STRING(255)

Path to the certificate revocation list, which may be present in PEM or DER format

sCiphers

STRING(255)

Cipher suites to be used, specified in OpenSSL string format

sVersion

STRING(80)

TLS version to be used

bNoServerCertCheck

BOOL

Disables verification of the server certificate validity. If communication is to take place without TLS encryption, this value must remain FALSE.

sPskIdentity

STRING(255)

PreSharedKey identity for TLS PSK connection

aPskKey

ARRAY[1..64] OF BYTE

PreSharedKey for TLS PSK connection

nPskKeyLen

USINT

Length of the PreSharedKey in bytes

sAzureSAS

STRING(511)

SAS token for connection to the Microsoft Azure IoT Hub