I recently upgraded my AT&T plan from mobile shared data to unlimited data, and as soon the technician did that my perfectly working 4G LTE link went down and 6-8 hours of talking to AT&T technical support failed to resolve the problem. I didn’t change any software or settings, and AT&T’s final response was “Contact the manufacturer”.
I’ve been very successfully using the Quectel EC25 (Revision: EC25AFAR05A04M4G) module with a Raspberry Pi. The device registers 100% properly, but the ppp connection now completely fails (see the log below).
Do I need a firmware upgrade for the EC25? What is ppp trying to tell me? Is ppp not supported anymore?
Any suggestions appreciated.
Hank
Jun 23 16:26:50 hostname rc.local[464]: → Initializing modem.
Jun 23 16:26:50 hostname rc.local[464]: → Sending: ATZ
Jun 23 16:26:50 hostname rc.local[464]: ATZ
Jun 23 16:26:50 hostname rc.local[464]: OK
Jun 23 16:26:50 hostname rc.local[464]: → Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Jun 23 16:26:50 hostname rc.local[464]: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Jun 23 16:26:50 hostname rc.local[464]: OK
Jun 23 16:26:50 hostname rc.local[464]: → Sending: AT+CGDCONT=1,“IP”,“broadband”
Jun 23 16:26:50 hostname rc.local[464]: AT+CGDCONT=1,“IP”,“broadband”
Jun 23 16:26:50 hostname rc.local[464]: OK
Jun 23 16:26:50 hostname rc.local[464]: → Modem initialized.
Jun 23 16:26:50 hostname rc.local[464]: → Sending: ATDT99#
Jun 23 16:26:50 hostname rc.local[464]: → Waiting for carrier.
Jun 23 16:26:50 hostname rc.local[464]: ATDT99#
Jun 23 16:26:50 hostname rc.local[464]: CONNECT 150000000
Jun 23 16:26:50 hostname rc.local[464]: → Carrier detected. Starting PPP immediately.
Jun 23 16:26:50 hostname rc.local[464]: → Starting pppd at Wed Jun 23 16:26:50 2021
Jun 23 16:26:50 hostname rc.local[464]: → Pid of pppd: 1816
Jun 23 16:26:50 hostname pppd[1816]: pppd 2.4.7 started by root, uid 0
Jun 23 16:26:50 hostname pppd[1816]: speed 720000000 not supported
Jun 23 16:26:50 hostname pppd[1816]: Using interface ppp0
Jun 23 16:26:50 hostname pppd[1816]: Connect: ppp0 <–> /dev/ttyUSB2
Jun 23 16:26:50 hostname pppd[1816]: CHAP authentication succeeded
Jun 23 16:26:50 hostname pppd[1816]: CHAP authentication succeeded
Jun 23 16:26:50 hostname dhcpcd[369]: ppp0: unsupported interface family 00
Jun 23 16:26:50 hostname rc.local[464]: → pppd: X?6[01]??6[01]??6[01]
Jun 23 16:26:50 hostname rc.local[464]: → Using interface ppp0
Jun 23 16:26:50 hostname rc.local[464]: → pppd: X?6[01]??6[01]??6[01]
Jun 23 16:26:50 hostname rc.local[464]: → pppd: X?6[01]??6[01]??6[01]
Jun 23 16:26:50 hostname rc.local[464]: → pppd: X?6[01]??6[01]??6[01]
Jun 23 16:26:50 hostname rc.local[464]: → pppd: X?6[01]??6[01]??6[01]
Jun 23 16:26:50 hostname dhcpcd[369]: ppp0: waiting for carrier
Jun 23 16:26:50 hostname dhcpcd[369]: ppp0: carrier acquired
Jun 23 16:26:50 hostname dhcpcd[369]: ppp0: IAID 70:70:70:30
Jun 23 16:26:50 hostname dhcpcd[369]: ppp0: waiting for 3rd party to configure IP address
Jun 23 16:26:51 hostname dhcpcd[369]: ppp0: soliciting an IPv6 router
Jun 23 16:26:51 hostname pppd[1816]: Modem hangup
Jun 23 16:26:51 hostname pppd[1816]: Connection terminated.
Jun 23 16:26:51 hostname rc.local[464]: → pppd: X?6[01]??6[01]??6[01]
Jun 23 16:26:51 hostname rc.local[464]: → pppd: X?6[01]??6[01]??6[01]
Jun 23 16:26:51 hostname dhcpcd[369]: ppp0: carrier lost
Jun 23 16:26:51 hostname pppd[1816]: Exit.
Jun 23 16:26:51 hostname dhcpcd[369]: ppp0: removing interface
Jun 23 16:26:51 hostname rc.local[464]: → Disconnecting at Wed Jun 23 16:26:51 2021
Jun 23 16:26:51 hostname rc.local[464]: → The PPP daemon has died: A modem hung up the phone (exit code = 16)
Jun 23 16:26:51 hostname rc.local[464]: → man pppd explains pppd error codes in more detail.
Jun 23 16:26:51 hostname rc.local[464]: → Try again and look into /var/log/messages and the wvdial and pppd man pages for more information.
Jun 23 16:26:51 hostname rc.local[464]: → Auto Reconnect will be attempted in 320 seconds