How to recover from Frame Error in DigiMesh module

XBee & XBee Gateway XBee - DigiMesh
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1

Using XB9X-DM, XBee SX, firmware 9007 setup as a Router in API 1 mode. Router XBee controlled by MCU acting as a client that periodically polls three (Non-routing) end devices via TX Request frames 0x10. Works great - as long as all end devices are powered up.
With two of the devices offline and polling process marching on, the router/client XBee randomly sends a frame type 0xFE to the MCU. 0xFE frame has one data byte = 0x04.

  1. What is frame type 0xFE? Not in XBee®/XBee-PRO SX v90001477 user manual.
  2. How to recover?

Many bad things happen, random Legacy TX Status frames, ND does not work, XCTU cannot communicate remotely…

2

Can you provide the entire frame you are seeing?

3

7E 00 02 FE 04 FD

4

FE (Frame Error)
04 (Erroneous checksum on last frame)

5

OK. Thanks. I got the same when I typed it into the XBee API Frames Interpreter.
I have verified the frames sent are well formed.

Do you know how to flush the XBee TX buffer?

6

You can do an ATFR which is a software command to restart the module.