CentOS 7 and ModemManager. Stuck in "Connecting-Disconnecting" after connection attempt.
Oskar .
oggw at hotmail.com
Fri Jul 27 08:43:57 UTC 2018
Solved the problem with CentOS 7.
I was not able to connect with ModemManager CLI. For some reason, it did not get an IP-address (DHCP) and DNS.
sudo ifconfig wwp0s20f0u6i4 up
sudo qmicli -d /dev/cdc-wdm0 –dms-set-operating-mode=online
dhclient -d -4 wwp0s20f0u6i4
Edit /etc/resolv.conf and add the following:
nameserver 8.8.8.8
This will fix the DNS-problem.
In Ubuntu 18.04 the DNS and DHCP came automatically.
Regards
Oskar
________________________________
Från: Oskar . <oggw at hotmail.com>
Skickat: den 25 juli 2018 13:05:20
Till: modemmanager-devel at lists.freedesktop.org
Ämne: SV: Modem is stuck in the state MM state machine "connecting-->disconnecting"
Hi,
I was able to get it working on Ubuntu 18.04. It was a faulty modem so I ordered a new one.
I got a new one and it worked 100% in Ubuntu 18.04. But when I try CentOS 7 it won't connect. I have tried qmicli and modemmanager.
I get an IP if I try ”qmicli —wds-get-current-settings”.
But when I try to connect with NetworkManager It does not work. ”www.google.com<http://www.google.com>” is not available.
[root at localhost ~]# qmicli -d /dev/cdc-wdm0 --wds-get-current-settings
[/dev/cdc-wdm0] Current settings retrieved:
IP Family: IPv4
IPv4 address: 10.55.169.239
IPv4 subnet mask: 255.255.255.224
IPv4 gateway address: 10.55.169.225
IPv4 primary DNS: 195.67.199.18
IPv4 secondary DNS: 195.67.199.19
MTU: 1500
Domains: none
[root at localhost ~]# qmi-network /dev/cdc-wdm0 status
Loading profile at /etc/qmi-network.conf...
APN: online.telia.se<http://online.telia.se>
APN user: unset
APN password: unset
qmi-proxy: no
Loading previous state from /tmp/qmi-network-state-cdc-wdm0...
Previous CID: 11
Previous PDH: 1139339560
Getting status with 'qmicli -d /dev/cdc-wdm0 --wds-get-packet-service-status --client-cid=11 --client-no-release-cid '...
Status: connected
/org/freedesktop/ModemManager1/Modem/0 (device id '1a6514ef8d6720f4ff819925ba572cc39d7dbbe9')
-------------------------
Hardware | manufacturer: 'Cellient Co. Ltd.'
| model: 'MPL200'
| revision: 'MPL200_05_0827 1 [Oct 16 2014 04:00:00]'
| supported: 'gsm-umts
| lte
| gsm-umts, lte'
| current: 'gsm-umts, lte'
| equipment id: '358049052670762'
-------------------------
System | device: '/sys/devices/pci0000:00/0000:00:14.0/usb1/1-6'
| drivers: 'qmi_wwan'
| plugin: 'Generic'
| primary port: 'cdc-wdm0'
| ports: 'wwp0s20f0u6i4 (net), cdc-wdm0 (qmi)'
-------------------------
Numbers | own : 'unknown'
-------------------------
Status | lock: 'sim-pin2'
| unlock retries: 'sim-pin (3), sim-pin2 (3), sim-puk (10), sim-puk2 (10)'
| state: 'registered'
| power state: 'on'
| access tech: 'lte'
| signal quality: '78' (recent)
-------------------------
Modes | supported: 'allowed: 2g, 3g, 4g; preferred: none'
| current: 'allowed: 2g, 3g, 4g; preferred: none'
-------------------------
Bands | supported: 'dcs, egsm, pcs, g850, u2100, u850, u900, eutran-iii, eutran-vii, eutran-xx'
| current: 'dcs, egsm, pcs, g850, u2100, u850, u900, eutran-iii, eutran-vii, eutran-xx'
-------------------------
IP | supported: 'ipv4, ipv6, ipv4v6'
-------------------------
3GPP | imei: '358049052670762'
| enabled locks: 'none'
| operator id: '24001'
| operator name: 'unknown'
| subscription: 'unknown'
| registration: 'home'
-------------------------
SIM | path: '/org/freedesktop/ModemManager1/SIM/0'
-------------------------
Bearers | paths: 'none'
[root at localhost ~]# mmcli -m 0 --simple-connect="apn=online.telia.se<http://online.telia.se>"
error: couldn't connect the modem: 'Timeout was reached'
DEBUG when running
[root at localhost ~]# mmcli -m 0 --simple-connect="apn=online.telia.se<http://online.telia.se>"
<<<<<< translated = [ strength = '-65' radio_interface = 'lte' ]
ModemManager[26624]: <debug> [1532520636.267082] [mm-broadband-modem-qmi.c:2841] signal_strength_get_quality_and_access_tech(): Signal strength (lte): -65 dBm
ModemManager[26624]: <debug> [1532520636.267093] [mm-broadband-modem-qmi.c:2874] signal_strength_get_quality_and_access_tech(): Signal strength: -65 dBm --> 78%
ModemManager[26624]: <debug> [1532520636.267139] [mm-iface-modem.c:1206] update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (78)
ModemManager[26624]: [/dev/cdc-wdm0] received message...
<<<<<< RAW:
<<<<<< length = 27
<<<<<< data = 01:1A:00:80:01:0C:04:00:00:22:00:0E:00:01:02:00:02:00:12:01:00:04:13:02:00:80:88
ModemManager[26624]: [/dev/cdc-wdm0] received generic indication (translated)...
<<<<<< QMUX:
<<<<<< length = 26
<<<<<< flags = 0x80
<<<<<< service = "wds"
<<<<<< client = 12
<<<<<< QMI:
<<<<<< flags = "indication"
<<<<<< transaction = 0
<<<<<< tlv_length = 14
<<<<<< message = "Packet Service Status" (0x0022)
<<<<<< TLV:
<<<<<< type = "Connection Status" (0x01)
<<<<<< length = 2
<<<<<< value = 02:00
<<<<<< translated = [ status = 'connected' reconfiguration_required = 'no' ]
<<<<<< TLV:
<<<<<< type = "IP Family" (0x12)
<<<<<< length = 1
<<<<<< value = 04
<<<<<< translated = ipv4
<<<<<< TLV:
<<<<<< type = 0x13
<<<<<< length = 2
<<<<<< value = 80:88
ModemManager[26624]: <debug> [1532520666.236326] [mm-broadband-modem-qmi.c:2951] load_signal_quality(): loading signal quality...
ModemManager[26624]: [/dev/cdc-wdm0] sent message...
<<<<<< RAW:
<<<<<< length = 13
<<<<<< data = 01:0C:00:00:03:04:00:0C:00:20:00:00:00
ModemManager[26624]: [/dev/cdc-wdm0] sent generic request (translated)...
<<<<<< QMUX:
<<<<<< length = 12
<<<<<< flags = 0x00
<<<<<< service = "nas"
<<<<<< client = 4
<<<<<< QMI:
<<<<<< flags = "none"
<<<<<< transaction = 12
<<<<<< tlv_length = 0
<<<<<< message = "Get Signal Strength" (0x0020)
ModemManager[26624]: [/dev/cdc-wdm0] received message...
<<<<<< RAW:
<<<<<< length = 25
<<<<<< data = 01:18:00:80:03:04:02:0C:00:20:00:0C:00:02:04:00:00:00:00:00:01:02:00:BF:08
ModemManager[26624]: [/dev/cdc-wdm0] received generic response (translated)...
<<<<<< QMUX:
<<<<<< length = 24
<<<<<< flags = 0x80
<<<<<< service = "nas"
<<<<<< client = 4
<<<<<< QMI:
<<<<<< flags = "response"
<<<<<< transaction = 12
<<<<<< tlv_length = 12
<<<<<< message = "Get Signal Strength" (0x0020)
<<<<<< TLV:
<<<<<< type = "Result" (0x02)
<<<<<< length = 4
<<<<<< value = 00:00:00:00
<<<<<< translated = SUCCESS
<<<<<< TLV:
<<<<<< type = "Signal Strength" (0x01)
<<<<<< length = 2
<<<<<< value = BF:08
<<<<<< translated = [ strength = '-65' radio_interface = 'lte' ]
ModemManager[26624]: <debug> [1532520666.251276] [mm-broadband-modem-qmi.c:2841] signal_strength_get_quality_and_access_tech(): Signal strength (lte): -65 dBm
ModemManager[26624]: <debug> [1532520666.251315] [mm-broadband-modem-qmi.c:2874] signal_strength_get_quality_and_access_tech(): Signal strength: -65 dBm --> 78%
ModemManager[26624]: <debug> [1532520666.251418] [mm-iface-modem.c:1206] update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (78)
ModemManager[26624]: [/dev/cdc-wdm0] received message...
<<<<<< RAW:
<<<<<< length = 18
<<<<<< data = 01:11:00:80:03:04:04:00:00:02:00:05:00:10:02:00:C6:08
ModemManager[26624]: [/dev/cdc-wdm0] received generic indication (translated)...
<<<<<< QMUX:
<<<<<< length = 17
<<<<<< flags = 0x80
<<<<<< service = "nas"
<<<<<< client = 4
<<<<<< QMI:
<<<<<< flags = "indication"
<<<<<< transaction = 0
<<<<<< tlv_length = 5
<<<<<< message = "Event Report" (0x0002)
<<<<<< TLV:
<<<<<< type = "Signal Strength" (0x10)
<<<<<< length = 2
<<<<<< value = C6:08
<<<<<< translated = [ strength = '-58' radio_interface = 'lte' ]
ModemManager[26624]: <debug> [1532520673.707340] [mm-broadband-modem-qmi.c:7038] event_report_indication_cb(): Signal strength indication (lte): -58 dBm --> 89%
ModemManager[26624]: <debug> [1532520673.707458] [mm-iface-modem.c:1206] update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (89)
ModemManager[26624]: <debug> [1532520696.236333] [mm-broadband-modem-qmi.c:2951] load_signal_quality(): loading signal quality...
ModemManager[26624]: [/dev/cdc-wdm0] sent message...
<<<<<< RAW:
<<<<<< length = 13
<<<<<< data = 01:0C:00:00:03:04:00:0D:00:20:00:00:00
ModemManager[26624]: [/dev/cdc-wdm0] sent generic request (translated)...
<<<<<< QMUX:
<<<<<< length = 12
<<<<<< flags = 0x00
<<<<<< service = "nas"
<<<<<< client = 4
<<<<<< QMI:
<<<<<< flags = "none"
<<<<<< transaction = 13
<<<<<< tlv_length = 0
<<<<<< message = "Get Signal Strength" (0x0020)
ModemManager[26624]: [/dev/cdc-wdm0] received message...
<<<<<< RAW:
<<<<<< length = 25
<<<<<< data = 01:18:00:80:03:04:02:0D:00:20:00:0C:00:02:04:00:00:00:00:00:01:02:00:C0:08
ModemManager[26624]: [/dev/cdc-wdm0] received generic response (translated)...
<<<<<< QMUX:
<<<<<< length = 24
<<<<<< flags = 0x80
<<<<<< service = "nas"
<<<<<< client = 4
<<<<<< QMI:
<<<<<< flags = "response"
<<<<<< transaction = 13
<<<<<< tlv_length = 12
<<<<<< message = "Get Signal Strength" (0x0020)
<<<<<< TLV:
<<<<<< type = "Result" (0x02)
<<<<<< length = 4
<<<<<< value = 00:00:00:00
<<<<<< translated = SUCCESS
<<<<<< TLV:
<<<<<< type = "Signal Strength" (0x01)
<<<<<< length = 2
<<<<<< value = C0:08
<<<<<< translated = [ strength = '-64' radio_interface = 'lte' ]
ModemManager[26624]: <debug> [1532520696.267030] [mm-broadband-modem-qmi.c:2841] signal_strength_get_quality_and_access_tech(): Signal strength (lte): -64 dBm
ModemManager[26624]: <debug> [1532520696.267043] [mm-broadband-modem-qmi.c:2874] signal_strength_get_quality_and_access_tech(): Signal strength: -64 dBm --> 80%
ModemManager[26624]: <debug> [1532520696.267094] [mm-iface-modem.c:1206] update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (80)
Best Regards
Oskar
________________________________
Från: Oskar . <oggw at hotmail.com>
Skickat: den 25 juli 2018 12:13:18
Till: Aleksander Morgado
Ämne: Re: Modem is stuck in the state MM state machine "connecting-->disconnecting"
Hi Aleksander,
I was able to get it working. It was a faulty modem.
I got a new one and it work 100% in Ubuntu 18.04. But when I try CentOS it wont connect. I have tried qmicli and modemmanager.
I get an IP if I try ”qmicli —wds-get-current-settings”.
But when I try to connect with NetworkManager It does not work. ”www.google.com” is not available.
[root at localhost ~]# qmicli -d /dev/cdc-wdm0 --wds-get-current-settings
[/dev/cdc-wdm0] Current settings retrieved:
IP Family: IPv4
IPv4 address: 10.55.169.239
IPv4 subnet mask: 255.255.255.224
IPv4 gateway address: 10.55.169.225
IPv4 primary DNS: 195.67.199.18
IPv4 secondary DNS: 195.67.199.19
MTU: 1500
Domains: none
[root at localhost ~]# qmi-network /dev/cdc-wdm0 status
Loading profile at /etc/qmi-network.conf...
APN: online.telia.se
APN user: unset
APN password: unset
qmi-proxy: no
Loading previous state from /tmp/qmi-network-state-cdc-wdm0...
Previous CID: 11
Previous PDH: 1139339560
Getting status with 'qmicli -d /dev/cdc-wdm0 --wds-get-packet-service-status --client-cid=11 --client-no-release-cid '...
Status: connected
/org/freedesktop/ModemManager1/Modem/0 (device id '1a6514ef8d6720f4ff819925ba572cc39d7dbbe9')
-------------------------
Hardware | manufacturer: 'Cellient Co. Ltd.'
| model: 'MPL200'
| revision: 'MPL200_05_0827 1 [Oct 16 2014 04:00:00]'
| supported: 'gsm-umts
| lte
| gsm-umts, lte'
| current: 'gsm-umts, lte'
| equipment id: '358049052670762'
-------------------------
System | device: '/sys/devices/pci0000:00/0000:00:14.0/usb1/1-6'
| drivers: 'qmi_wwan'
| plugin: 'Generic'
| primary port: 'cdc-wdm0'
| ports: 'wwp0s20f0u6i4 (net), cdc-wdm0 (qmi)'
-------------------------
Numbers | own : 'unknown'
-------------------------
Status | lock: 'sim-pin2'
| unlock retries: 'sim-pin (3), sim-pin2 (3), sim-puk (10), sim-puk2 (10)'
| state: 'registered'
| power state: 'on'
| access tech: 'lte'
| signal quality: '78' (recent)
-------------------------
Modes | supported: 'allowed: 2g, 3g, 4g; preferred: none'
| current: 'allowed: 2g, 3g, 4g; preferred: none'
-------------------------
Bands | supported: 'dcs, egsm, pcs, g850, u2100, u850, u900, eutran-iii, eutran-vii, eutran-xx'
| current: 'dcs, egsm, pcs, g850, u2100, u850, u900, eutran-iii, eutran-vii, eutran-xx'
-------------------------
IP | supported: 'ipv4, ipv6, ipv4v6'
-------------------------
3GPP | imei: '358049052670762'
| enabled locks: 'none'
| operator id: '24001'
| operator name: 'unknown'
| subscription: 'unknown'
| registration: 'home'
-------------------------
SIM | path: '/org/freedesktop/ModemManager1/SIM/0'
-------------------------
Bearers | paths: 'none'
[root at localhost ~]# mmcli -m 0 --simple-connect="apn=online.telia.se"
error: couldn't connect the modem: 'Timeout was reached'
DEBUG
<<<<<< translated = [ strength = '-65' radio_interface = 'lte' ]
ModemManager[26624]: <debug> [1532520636.267082] [mm-broadband-modem-qmi.c:2841] signal_strength_get_quality_and_access_tech(): Signal strength (lte): -65 dBm
ModemManager[26624]: <debug> [1532520636.267093] [mm-broadband-modem-qmi.c:2874] signal_strength_get_quality_and_access_tech(): Signal strength: -65 dBm --> 78%
ModemManager[26624]: <debug> [1532520636.267139] [mm-iface-modem.c:1206] update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (78)
ModemManager[26624]: [/dev/cdc-wdm0] received message...
<<<<<< RAW:
<<<<<< length = 27
<<<<<< data = 01:1A:00:80:01:0C:04:00:00:22:00:0E:00:01:02:00:02:00:12:01:00:04:13:02:00:80:88
ModemManager[26624]: [/dev/cdc-wdm0] received generic indication (translated)...
<<<<<< QMUX:
<<<<<< length = 26
<<<<<< flags = 0x80
<<<<<< service = "wds"
<<<<<< client = 12
<<<<<< QMI:
<<<<<< flags = "indication"
<<<<<< transaction = 0
<<<<<< tlv_length = 14
<<<<<< message = "Packet Service Status" (0x0022)
<<<<<< TLV:
<<<<<< type = "Connection Status" (0x01)
<<<<<< length = 2
<<<<<< value = 02:00
<<<<<< translated = [ status = 'connected' reconfiguration_required = 'no' ]
<<<<<< TLV:
<<<<<< type = "IP Family" (0x12)
<<<<<< length = 1
<<<<<< value = 04
<<<<<< translated = ipv4
<<<<<< TLV:
<<<<<< type = 0x13
<<<<<< length = 2
<<<<<< value = 80:88
ModemManager[26624]: <debug> [1532520666.236326] [mm-broadband-modem-qmi.c:2951] load_signal_quality(): loading signal quality...
ModemManager[26624]: [/dev/cdc-wdm0] sent message...
<<<<<< RAW:
<<<<<< length = 13
<<<<<< data = 01:0C:00:00:03:04:00:0C:00:20:00:00:00
ModemManager[26624]: [/dev/cdc-wdm0] sent generic request (translated)...
<<<<<< QMUX:
<<<<<< length = 12
<<<<<< flags = 0x00
<<<<<< service = "nas"
<<<<<< client = 4
<<<<<< QMI:
<<<<<< flags = "none"
<<<<<< transaction = 12
<<<<<< tlv_length = 0
<<<<<< message = "Get Signal Strength" (0x0020)
ModemManager[26624]: [/dev/cdc-wdm0] received message...
<<<<<< RAW:
<<<<<< length = 25
<<<<<< data = 01:18:00:80:03:04:02:0C:00:20:00:0C:00:02:04:00:00:00:00:00:01:02:00:BF:08
ModemManager[26624]: [/dev/cdc-wdm0] received generic response (translated)...
<<<<<< QMUX:
<<<<<< length = 24
<<<<<< flags = 0x80
<<<<<< service = "nas"
<<<<<< client = 4
<<<<<< QMI:
<<<<<< flags = "response"
<<<<<< transaction = 12
<<<<<< tlv_length = 12
<<<<<< message = "Get Signal Strength" (0x0020)
<<<<<< TLV:
<<<<<< type = "Result" (0x02)
<<<<<< length = 4
<<<<<< value = 00:00:00:00
<<<<<< translated = SUCCESS
<<<<<< TLV:
<<<<<< type = "Signal Strength" (0x01)
<<<<<< length = 2
<<<<<< value = BF:08
<<<<<< translated = [ strength = '-65' radio_interface = 'lte' ]
ModemManager[26624]: <debug> [1532520666.251276] [mm-broadband-modem-qmi.c:2841] signal_strength_get_quality_and_access_tech(): Signal strength (lte): -65 dBm
ModemManager[26624]: <debug> [1532520666.251315] [mm-broadband-modem-qmi.c:2874] signal_strength_get_quality_and_access_tech(): Signal strength: -65 dBm --> 78%
ModemManager[26624]: <debug> [1532520666.251418] [mm-iface-modem.c:1206] update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (78)
ModemManager[26624]: [/dev/cdc-wdm0] received message...
<<<<<< RAW:
<<<<<< length = 18
<<<<<< data = 01:11:00:80:03:04:04:00:00:02:00:05:00:10:02:00:C6:08
ModemManager[26624]: [/dev/cdc-wdm0] received generic indication (translated)...
<<<<<< QMUX:
<<<<<< length = 17
<<<<<< flags = 0x80
<<<<<< service = "nas"
<<<<<< client = 4
<<<<<< QMI:
<<<<<< flags = "indication"
<<<<<< transaction = 0
<<<<<< tlv_length = 5
<<<<<< message = "Event Report" (0x0002)
<<<<<< TLV:
<<<<<< type = "Signal Strength" (0x10)
<<<<<< length = 2
<<<<<< value = C6:08
<<<<<< translated = [ strength = '-58' radio_interface = 'lte' ]
ModemManager[26624]: <debug> [1532520673.707340] [mm-broadband-modem-qmi.c:7038] event_report_indication_cb(): Signal strength indication (lte): -58 dBm --> 89%
ModemManager[26624]: <debug> [1532520673.707458] [mm-iface-modem.c:1206] update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (89)
ModemManager[26624]: <debug> [1532520696.236333] [mm-broadband-modem-qmi.c:2951] load_signal_quality(): loading signal quality...
ModemManager[26624]: [/dev/cdc-wdm0] sent message...
<<<<<< RAW:
<<<<<< length = 13
<<<<<< data = 01:0C:00:00:03:04:00:0D:00:20:00:00:00
ModemManager[26624]: [/dev/cdc-wdm0] sent generic request (translated)...
<<<<<< QMUX:
<<<<<< length = 12
<<<<<< flags = 0x00
<<<<<< service = "nas"
<<<<<< client = 4
<<<<<< QMI:
<<<<<< flags = "none"
<<<<<< transaction = 13
<<<<<< tlv_length = 0
<<<<<< message = "Get Signal Strength" (0x0020)
ModemManager[26624]: [/dev/cdc-wdm0] received message...
<<<<<< RAW:
<<<<<< length = 25
<<<<<< data = 01:18:00:80:03:04:02:0D:00:20:00:0C:00:02:04:00:00:00:00:00:01:02:00:C0:08
ModemManager[26624]: [/dev/cdc-wdm0] received generic response (translated)...
<<<<<< QMUX:
<<<<<< length = 24
<<<<<< flags = 0x80
<<<<<< service = "nas"
<<<<<< client = 4
<<<<<< QMI:
<<<<<< flags = "response"
<<<<<< transaction = 13
<<<<<< tlv_length = 12
<<<<<< message = "Get Signal Strength" (0x0020)
<<<<<< TLV:
<<<<<< type = "Result" (0x02)
<<<<<< length = 4
<<<<<< value = 00:00:00:00
<<<<<< translated = SUCCESS
<<<<<< TLV:
<<<<<< type = "Signal Strength" (0x01)
<<<<<< length = 2
<<<<<< value = C0:08
<<<<<< translated = [ strength = '-64' radio_interface = 'lte' ]
ModemManager[26624]: <debug> [1532520696.267030] [mm-broadband-modem-qmi.c:2841] signal_strength_get_quality_and_access_tech(): Signal strength (lte): -64 dBm
ModemManager[26624]: <debug> [1532520696.267043] [mm-broadband-modem-qmi.c:2874] signal_strength_get_quality_and_access_tech(): Signal strength: -64 dBm --> 80%
ModemManager[26624]: <debug> [1532520696.267094] [mm-iface-modem.c:1206] update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/0: signal quality updated (80)
Best Regards
Oskar
> 8 juli 2018 kl. 14:51 skrev Aleksander Morgado <aleksander at aleksander.es>:
>
> Hey,
>
>
>>
>> Do you have any idea hat type of error this could be?
>> It is "registered" and waits until I type mmcli -m 0
>> --simple-connect="apn=<APN>".
>> And then outputs Timeout reached.
>>
>
> Could you gather a full debug log of this attempt and send it here?
>
> --
> Aleksander
> https://aleksander.es
aleksander.es – Freelance GNU/Linux software developer<https://aleksander.es/>
aleksander.es
Over the past few years I have worked as a software consultant, developing new features to already existing software or even writing completely new tools from scratch.
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