Networking Direct and indirect transmission
Digi XBee3® 802.15.4 RF Module User Guide
65
Type Meaning
0x06 Coordinator formed a new network.
0x0D Input voltage is too high, which prevents transmissions.
Association indicator status codes
The XBee3 802.15.4 RF Module can potentially give any of the status codes in response to AI command
in the following table.
Code Meaning
0x00 Coordinator successfully started, End device successfully associated, or operating in peer to
peer mode where no association is needed.
0x03 Active Scan found a PAN coordinator, but it is not currently accepting associations.
0x04 Active Scan found a PAN coordinator in a beacon-enabled network, which is not a supported
feature.
0x05 Active Scan found a PAN, but the PAN ID does not match the configured PAN ID on the
requesting end device and bit 0 of A1 is not set to allow reassignment of PAN ID.
0x06 Active Scan found a PAN on a channel does not match the configured channel on the
requesting end device and bit 1 of A1 is not set to allow reassignment of the channel.
0x0C Association request failed to get a response.
0x13 End device is disassociated or is in the process of disassociating.
0xFF Initialization time; no association status has been determined yet.
Direct and indirect transmission
There are two methods to transmit data:
n Direct transmission: data is transmitted immediately to the Destination Address
n Indirect transmission: a packet is retained for a period of time and is only transmitted after the
destination device (source address = destination address) requests the data.
Indirect transmissions can only occur on a device configured to be an indirect messaging coordinator.
Indirect transmissions are useful to ensure packet delivery to a sleeping device. Indirect messaging
allows messages to reliably be sent asynchronously to sleeping end devices, or operate like an
incoming mailbox for a P2P network. A TX request can be made when the end device is sleeping and
unable to receive RF data, and instead of being immediately send to an inoperative device, the packet
is queued by the indirect messaging coordinator until the end device wakes or polls it for data.
Note that indirect messaging works best with association and end devices cyclically sleeping, but can
be used in a P2P configuration by setting CE command to 1 on the device that you want to hold the
indirect messages and configuring the other device to poll correctly. In the context of indirect
messaging, an end device refers not just to a device with A1 (End Device Association) set to associate
but the target of an indirect message. Similarly, an indirect messaging coordinator does not have to
allow association (A2 (Coordinator Association)) to send messages indirectly.
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