Estimating Coordinator Memory Exhaustion during Large Scale Mesh Node Provisioning
Provisioner memory exhaustion during large mesh commissioning is prevented by sizing SRAM to hold concurrent DTLS context peaks plus routing table expansion
DTLS 1.2 Handshake
Meaning
Encrypted transmission over user datagram protocol requires a specific sequence of messages to establish encryption parameters and verify the identity of the endpoints. The dtls 1.2 handshake adapts the standard transport layer security logic to handle the possibility of packet loss or reordering in unreliable networks. It results in a shared secret that the two devices use to protect the subsequent data exchange from interception or tampering.
Session Negotiation
Exchanging cipher suites and compression methods allows the client and server to agree on the strongest common security settings. A dtls 1.2 handshake begins with a hello message that lists the supported cryptographic algorithms for the connection. If the server cannot find a match among the proposed options, it terminates the process to prevent the use of weak encryption.
Packet Reliability
Retransmission timers and sequence numbers confirm that the cryptographic exchange completes even if some packets disappear in transit. Since the dtls 1.2 handshake occurs over a connectionless transport, the protocol must manually track which flight of messages arrived. The sender waits for an acknowledgment and resends the entire flight if the response window expires.
Security Authentication
Digital certificates or pre-shared keys provide the necessary proof of identity for each participating device. During a dtls 1.2 handshake, the server usually presents a certificate to the client to confirm its legitimacy before the key exchange continues. This step prevents man-in-the-middle attacks where an imposter might try to intercept the communication.
Authenticators use these credentials to build a chain of trust back to a root authority, which is a fundamental requirement for operating on public networks.