Local digital twins configuration

Customize the local digital twins persistency, access and synchronization.

Properties

To control all aspects of the local digital twins behavior.

Property	Type	Default	Description
thingsDb	string	things.db	Path to the file where digital twins will be stored
Remote connectivity
address	string	mqtts://mqtt.bosch-iot-hub.com:8883	Address of the MQTT endpoint that the local digital twins will connect for the remote communication, the format is: `scheme://host:port`
deviceId	string		Device unique identifier
authId	string		Authentication unique identifier that is a part of the credentials
tenantId	string		Tenant unique identifier that the device belongs to
password	string		Password that is a part of the credentials
clientId	string		MQTT client unique identifier
policyId	string		Policy unique identifier of the digital twin
Remote connectivity - TLS
caCert	string	iothub.crt	PEM encoded CA certificates file
cert	string		PEM encoded certificate file to authenticate to the MQTT endpoint
key	string		PEM encoded unencrypted private key file to authenticate to the MQTT endpoint
deviceIdPattern	string		Pattern to generate the device identifier, `{{subject-dn}}` and `{{subject-cn}}` placeholders can be part of it
Remote connectivity - TLS over TPM
tpmDevice	string		Path to the device file or the unix socket to access the TPM 2.0
tpmHandle	int		TPM 2.0 storage root key handle, the type is unsigned 64-bit integer
tpmKeyPub	string		File path to the public part of the TPM 2.0 key
tpmKey	string		File path to the private part of the TPM 2.0 key
Local connectivity
localAddress	string	tcp://localhost:1883	Address of the MQTT server/broker that the local digital twins will connect for the local communication, the format is: `scheme://host:port`
localUsername	string		Username that is a part of the credentials
localPassword	string		Password that is a part of the credentials
Local connectivity - TLS
localCACert	string		PEM encoded CA certificates file
localCert	string		PEM encoded certificate file to authenticate to the MQTT server/broker
localKey	string		PEM encoded unencrypted private key file to authenticate to the MQTT server/broker
Logging
logFile	string	log/local-digital-twins.log	Path to the file where log messages are written
logLevel	string	INFO	All log messages at this or a higher level will be logged, the log levels in descending order are: ERROR, WARN, INFO, DEBUG and TRACE
logFileCount	int	5	Log file maximum rotations count
logFileMaxAge	int	28	Log file rotations maximum age in days, use 0 to not remove old log files
logFileSize	int	2	Log file size in MB before it gets rotated

Example

The minimal required configuration to enable the local digital twins and their synchronization with the publicly available Eclipse Hono sandbox.

{
    "address": "hono.eclipseprojects.io:1883",
    "caCert": "/etc/local-digital-twins/iothub.crt",
    "tenantId": "org.eclipse.kanto",
    "deviceId": "org.eclipse.kanto:exampleDevice",
    "authId": "org.eclipse.kanto_example",
    "password": "secret",
    "thingsDb": "/var/lib/local-digital-twins/thing.db",
    "logFile": "/var/log/local-digital-twins/local-digital-twins.log"
}

Template

The configuration can be further adjusted according to the use case. The following template illustrates all possible properties with their default values.

Be aware that some combinations may be incompatible

{
    "thingsDb": "things.db",
    "address": "mqtts://mqtt.bosch-iot-hub.com:8883",
    "deviceId": "",
    "authId": "",
    "tenantId": "",
    "password": "",
    "clientId": "",
    "policyId": "",
    "caCert": "iothub.crt",
    "cert": "",
    "key": "",
    "deviceIdPattern": "",
    "tpmDevice": "",
    "tpmHandle": 0,
    "tpmKeyPub": "",
    "tpmKey": "",
    "localAddress": "tcp://localhost:1883",
    "localUsername": "",
    "localPassword": "",
    "localCACert": "",
    "localCert": "",
    "localKey": "",
    "logFile": "log/local-digital-twins.log",
    "logLevel": "INFO",
    "logFileCount": 5,
    "logFileMaxAge": 28,
    "logFileSize": 2
}

Last modified June 28, 2024