Secure access Send data to a secured remote node
Digi XBee® 3 Zigbee® RF Module
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4. Send remote AT Commands to the remote server using the Remote AT Command Request
frame - 0x17 with bit 4 of the Command Options field set. Bit 4 indicates the AT command
should be sent securely.
Send data to a secured remote node
The process to send secured data is very similar to remotely configuring a node. The following steps
show how a client node can authenticate with a server node and send data securely.
1. Send a Secure Session Control frame - 0x2E to the client node with:
n The server's 64-bit address.
n The desired timeout.
n The options field set to 0x00 for fixed timeout login or to 0x04 for inter-packet timeout
refresh login.
n The password of the server node.
2. Wait for the Secure Session Response frame - 0xAE to determine if the the authentication was
successful.
3. Data can now be sent securely with Transmit Request frame - 0x10 and Explicit Addressing
Command frame - 0x11 provided that:
n Bit 4 in the transmit options field is set to indicate that the data should be sent
encrypted.
4. The returned Receive Packet frame - 0x90 and Explicit Rx Indicator frame - 0x91 receive
options fields should also have bit 4 set.
Note The maximum payload per transmission size is reduced by four bytes due to the additional
encryption overhead. NP (Maximum Packet Payload Bytes) will not reflect this change when the
session is going on.
A node can be secured against emitting data out the serial port that was received insecurely via the
SA command. This means that a remote node will not emit any serial data if it was received insecurely
(TO (Transmit Options) bit 4 was not set). This includes any data in Transparent mode, 0x80, 0x90 and
0x91 frames.
End a session from a server
If bit 3 of AZ (Extended API Options) is set, the server emits an extended modem status (whenever a
client establishes a session with it) that includes the 64-bit address of the client. Using these statuses
the MCU connected to the server can keep track of sessions established with the server. To end a
session from the server do the following:
1. Send a Secure Session Control frame - 0x2E to the server node with:
n The client's 64-bit address.
n The options field set to 0x02 for server side session termination.
n Set the timeout to 0x0000.
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