lwm2m_coap: DTLS Cid Length - thongsboard3

application/src/main/resources/thingsboard.yml

@@ -1018,7 +1018,7 @@ transport:
       bind_address: "${COAP_DTLS_BIND_ADDRESS:0.0.0.0}"
       # CoAP DTLS bind port
       bind_port: "${COAP_DTLS_BIND_PORT:5684}"
-      # Server DTLS credentials
+        # Server DTLS credentials
         # CoAP DTLS connection ID length. RFC 9146, Connection Identifier for DTLS 1.2
         # Default: off
         # Control usage of DTLS connection ID length (CID).

transport/coap/src/main/resources/tb-coap-transport.yml

@@ -155,6 +155,17 @@ transport:
       # CoAP DTLS bind port
       bind_port: "${COAP_DTLS_BIND_PORT:5684}"
       # Server DTLS credentials
+        # Server DTLS credentials
+        # CoAP DTLS connection ID length. RFC 9146, Connection Identifier for DTLS 1.2
+        # Default: off
+        # Control usage of DTLS connection ID length (CID).
+        # - 'off' to deactivate it.
+        # - 'on' to activate Connection ID support (same as CID 0 or more 0).
+        # - A positive value defines generated CID size in bytes.
+        # - A value of 0 means we accept using CID but will not generate one for foreign peer (enables support but not for incoming traffic).
+        # - A value between 0 and <= 4: SingleNodeConnectionIdGenerator is used
+      # - A value that are > 4: MultiNodeConnectionIdGenerator is used
+      connection_id_length: "${COAP_DTLS_CONNECTION_ID_LENGTH:}"
       credentials:
         # Server credentials type (PEM - pem certificate file; KEYSTORE - java keystore)
         type:  "${COAP_DTLS_CREDENTIALS_TYPE:PEM}"

transport/lwm2m/src/main/resources/tb-lwm2m-transport.yml

@@ -166,6 +166,16 @@ transport:
     dtls:
       # RFC7925_RETRANSMISSION_TIMEOUT_IN_MILLISECONDS = 9000
       retransmission_timeout: "${LWM2M_DTLS_RETRANSMISSION_TIMEOUT_MS:9000}"
+        # CoAP DTLS connection ID length for LWM2M. RFC 9146, Connection Identifier for DTLS 1.2
+        # Default: off
+        # Control usage of DTLS connection ID length (CID).
+        # - 'off' to deactivate it.
+        # - 'on' to activate Connection ID support (same as CID 0 or more 0).
+        # - A positive value defines generated CID size in bytes.
+        # - A value of 0 means we accept using CID but will not generate one for foreign peer (enables support but not for incoming traffic).
+        # - A value between 0 and <= 4: SingleNodeConnectionIdGenerator is used
+        # - A value that are > 4: MultiNodeConnectionIdGenerator is used
+      connection_id_length: "${LWM2M_DTLS_CONNECTION_ID_LENGTH:}"
     server:
       # LwM2M Server ID
       id: "${LWM2M_SERVER_ID:123}"