Digi XBee 3 Cellular LTE-M User Manual page 134

Modes
OK ATD*99***1#
CONNECT
Step 4: Run PPPD
PPPD is the program that brings up the PPP interface.
1. You should bring down any other network interfaces that may complicate routing.
2. Run PPPD to bring up the PPP interface.
sudo pppd
3. Various LCP, PAP and IPCP messages should be output. If the interface was brought up
correctly ifconfig should list a PPP interface as pppx (where x is a number).
4. Ping a web server from the PPP interface.
ping www.digi.com
Step 5: Low power use case
You may want to reduce power consumption by turning off the XBee modem. Follow this process to
properly bring down the PPP connection and shut down the modem.
1. Terminate PPPD by sending a terminate signal: Ctrl+C
2. Issue the shutdown command to the modem over the USB connection.
AT+CPWROFF
3. Wait for an OK response.
4. When received, remove power from the XBee.
5. Restart the PPP connection.
a. Power on the XBee.
b. Issue the following command:
sudo pppd
Note Do not power cycle the modem too often as it can lead to network registration rejection. Cycling
should not be performed more than a few times an hour. Check with your network carrier for the
exact limits.
Troubleshooting
Error after running sudo pppd
+CME ERRORScript /usr/sbin/chat -V -t 60 -f net-chat finished (pid 5523), status = 0x4
Connect script failed
This indicates that the <APN> field was most likely not set correctly in the net-chat script.
Error after running sudo pppd
pppd: In file /etc/ppp/options: unrecognized option '/dev/ppp_direct_usb'
Digi XBee® 3 Cellular LTE-M/NB-IoT Global Smart Modem User Guide
USB direct mode
134