Difference between revisions of "SW startup guide for Vayu 2G"
(→Hardware and Software FAQ for Vayu Capes) |
(→Adding a DNS if BBB doesnt get it) |
||
| Line 309: | Line 309: | ||
nameserver 208.67.222.222 | nameserver 208.67.222.222 | ||
| + | == Using GPS module with Debian Wheezy == | ||
Please refer to [[SW_startup_guide_for_Vayu_GPS| Software startup Guide for VAYU GPS]] | Please refer to [[SW_startup_guide_for_Vayu_GPS| Software startup Guide for VAYU GPS]] | ||
Revision as of 19:20, 11 March 2014
Contents
Software overview for using Vayu-2G-A/Vayu-2GP-A Cape
Data connection is established based on PPP protocols. Wvdial is mainly used to configure the dialup settings. For setting up various settings for PPP connection and establishing a data connection on these capes follow the link to the wiki
- Way to setup the Vayu 2G Capes
- How to read location and coarse time as NMEA-0183 message from the serial UART ttyO4 port
- How to write wvdial conf files for any network
- Sample wvdial.conf file for AT&T and T-Mobile USA
For using the Vayu-2G-A/Vayu-2GP-A Cape, please ensure that you have the following :
1. PPS drivers enabled in kernel, required if GPS module is present.
2. Vayu Device tree overlay file
You can either download kernel patches containing the same to use with your existing images or you can download our prebuilt MicroSD card image or EMMC flasher image .
All the images and files and extra support on software can be found here : Vayu_Cape_SW_images_and_drivers
Device enable for Vayu-2G-A/Vayu-2GP-A Cape
GSM/GPRS Modem
Note: All commands are executed as root on Debian unless otherwise mentioned.
GSM/GPRS Modem is connected to Beaglebone Black at UART1 port. To access the Modem from Beaglebone Black, we need to first enable the UART1 (ttyO1) port in kernel. For this do following :
Step 1. Boot into Beaglebone Black , running Debian Wheezy on it. Login as root user
Step 2. Go to /lib/firmware
cd /lib/firmware
Step 3. After ensuring that there is a file BB-UART1-00A0.dtbo in directly, apply the device tree overlay by : echo BB-UART1 > /sys/devices/bone_capemgr.9/slots Step 4. On reading ‘’’slots’’’ if you are able to see UART1 , then it has been applied successfully.
cat /sys/devices/bone_capemgr.9/slots
[[Image:]] Step 5. You can verify that UART1 (ttyO1 ) by checking for ttyO1 in devices (/dev/)
ls /dev/ttyO*
Output will show /dev/ttyO0 and /dev/ttyO1 . Over UART1 port we can communicate with our modem and execute AT commands too when required. The UART port of modem is available at one instant only, either it is establishing ppp connection or AT commands are executed on it. We now see and understand different modes for controlling our GPS/GPRS Modem and ensure that it is properly powered on and available for establishing data connection.
The Modem has different operating modes.
[[Image:]]
To use the modem after powering up the Cape, it needs to be properly turned on.
For the Modem , there is a ON/OFF pin and a Reset pin which are used to turn the modem on/off or soft reset and hard reset it. Now, on the Vayu Cape, there are two Leds which indicate status of 2G module : i. STATUS LED D3 : This Led gives the state of the Modem. It is on when the module is turned on and off when it is turned off. ii. NETLIGHT LED D4 : It has different states depending on the mode of operation of the Modem - a. Off when Modem is off b. 64ms ON/800ms OFF when Modem is on but it is not registered on a network i.e. sim card has not been detected or is not present c. 64ms ON/3000ms OFF when Modem is on and is registered to a network i.e. sim card has been detected but a network connection has not been established. d. 64ms ON/300ms OFF when Modem is on and GPRS communication has been established.
On the Cape, ON/OFF pin and Reset pin can be controlled via a push button switch as well as GPIOs assigned to them on Beaglebone Black.
For ON/OFF pin, S1 is the ON/OFF push button switch provided on cape and GPIO45 in Beaglebone Black is assigned the same. GPIO45 should always be set high.
For Reset pin, S2 is the Hard Reset push button switch provided on cape and GPIO60 in Beaglebone Black is assigned the same. GPIO60 should always be set high.
To Power on Modem :
User can Power on or off the modem by hardware push button or by software method (prefered)
- pressing the switch S1 for atleast 1s and then releasing it after Beaglebone Black is booted properly
- By setting GPIO45 ‘Active Low’ for atleast 1s and then setting it ‘Active high’.
Also, when Cape and Beaglebone black, both are powered up and booted, GPIO45 is initially set low internally.
Step 6: Set GPIO45 High, after Beaglebone Black has booted completely with Vayu Cape mounted on it to turn on the modem properly.
Step 7:
Once ttyO1 port was enabled, you can execute AT commands for the modem on it or see the messages from the modem that are sent there. You can use minicom for it.
apt-get install minicom (This is there in the SW image) minicom –s
and set serial port settings as /dev/ttyO1 115200 8N1 When you , properly turn on the modem after you have booted i.e. set GPIO45 high, or whenever modem is turned ON , you will see an output on /dev/ttyO1 port. RDY Power On of Modem is indicated by the STATUS GPIO or LED which should be ON . Also the NETLIGHT LED will start blinking depending on whether SIM Card is present or not.
To power off Modem : Modem can be powered off by : 1. Normal power down procedure : Power down by ON/OFF Pin
- Press the switch S1 for atleast 1s and then release it
- Set GPIO45 low for atleast 1s and set it high
2. Normal power down procedure : Power down by AT command AT+CPOWD=1 , at /dev/ttyO1 3. Abnormal Power down procedure : Over-voltage or under-voltage automatic power down 4. Abnormal Power down procedure : over-temperature or under-temperature automatic power down
In Normal powerdown, the modem port , /dev/ttyO1 will read out the following message :
NORMAL POWER DOWN
In Abnormal Power down Procedure , AT commands cannot be issued anymore, only RTC is active.
Following URC will be reported :
If voltage <= 3.3V, UNDER-VOLTAGE WARNING
If voltage >= 4.7V, OVER-VOLTAGE WARNING
If voltage < 3.2V, UNDER-VOLTAGE POWERDOWN
If voltage > 4.8V, OVER-VOLTAGE POWERDOWN
If temperature > 80degree Celsius , +CMTE:1
If temperature < -30degree Celsius , +CMTE:-1
If temperature > +85degree Celsius, +CMTE:2
If temperature < -40degree Celsius, _CMTE:-2
Powerdown of Modem is indicated by STATUS LED not glowing or GPIO going low. Also, NETLIGHT LED will be Off.
Soft Reset the Modem : Power Down the Module Wait for atleast 800ms after STATUS LED switched off or GPIO went low Power On the Module Hard Reset the Modem: This is an emergency reset only.Use this only when ON/OFF pin or “AT+CPOWD=1” have no effect. The Hard reset pin can be pulled low for atleast 1.2s and then set high.
GPIO60 should be high all the time. S2 is Hard reset push button switch for Modem.
The GPRS modem on the cape has been shipped pre-set with settings so that its serial port is working and appropriate settings has been stored in the modem. For more details about its operation modes refer to datasheet.
Currently module has Data communication enabled and is fully functional (+CFUN=1) and in sleep mode 0 (+CSCLK=0) and will not go to sleep ever.
To change the modes or any settings related to modem , you need access to AT ports and run AT commands there.
Considering that, Cape is connected properly to Beaglebone black and user is logged in as root and has checked for UART1 port, we check that the Modem is turned on properly before trying to establish a connection, so:
i. D3 is continuously on and D4 is blinking as 64ms ON/800ms OFF, when SIM card is not present or not detected/inserted properly.
ii. D3 is continuously on and D4 is blinking as 64ms ON/3000 ms OFF when a valid SIM card is present. If SIM card was inserted while the modem was on, please software reset the modem by turning it OFF and then ON again using Software GPIO commands or Push button switch. [refer to]
If any other state of LEDs is present, please soft reset the modem using push button switch or GPIOs.
So when it is established that modem is in ii we try to establish connection
Summarizing, following are the steps to enable PPP connection using the Modem :
Step 1 : Ensure that a GSM/GPRS enabled SIM card is placed in the simcard slot, before Beaglebone black is booted up with the cape.
Step 2 : Enable UART1(/dev/ttyO1 ) in the kernel by applying its device tree overlay from /lib/firmware directory.
Step 3: Check for the status of the LEDs, D3(STATUS) and D4(NETLIGHT). D3 should be high and D4 should be blinking. If no sim card is present, and D4 blinks accordingly, then insert the sim card in the slot and Soft Reset the Modem.
Step 4 : Now we have to ensure that the modem is properly switched on. The GPIO45 is pulled low in Beaglebone black when it has booted , but ON/OFF Pin in modem also has internal pullup so basically it is turned on when the Board boots up. But to be safe, we have to set the GPIO45 high.
When you turn GPIO45 high, check once again that setting the ON/OFF pin high, completed the Power ON cycle for the modem and not the Power OFF cycle, by checking the STATUS LED which should still be ON.
Step 5: Once it has been ensured modem is properly switched on, we can proceed with establishing PPP connection either using PPPd or Wvdial. For more details on using them, please refer to Application notes for 2G/2GP cape.
All the images and files and extra support on software can be found here :
http://www.yantrr.com/products/m2m-cape-for-beaglebone/support/
Wvdial Configuration for Debian Wheezy :
Note : All commands are recommended to executed as root user.
Download and install Wvdial
$ apt-get install wvdial
Executing the following command usually sets the wvdial.conf file which is used for dialing to GPRS communication, but since here our modem port is on a UART(/dev/ttyO1) and not on /dev/ttyS* or /dev/ttyUSB* ports, we will have to manually configure it.
$ wvdialconf
So, open the wvdial.conf file
$ nano /etc/wvdial.conf
Considering that, you have the USERNAME, PASSWORD and APN available for the service provider of the sim card being used, edit and make wvdial.conf file like this.
[Dialer Defaults] Modem Type = Analog ModemPhone = *99# ISDN = 0 Baud = 115200 Username = USERNAME Password = PASSWORD Modem = /dev/ttyO1 Init1 = ATZ Init2 = at+cgdcont=1,"ip","APN" Stupid Mode = 1
Usually for GSM Networks, Modemphone is *99# or *99***1# After editing save and exit, now run wvdial for establishing communication.
$ wvdial
You can also edit the wvdial.conf file for multiple service providers by providing its name here [Dialer Defaults] :
[Dialer Vodafone] Modem Type = Analog Modem Phone = *99# ISDN = 0 Baud = 115200 Username = 0 Password = 0 Modem = /dev/ttyO1 Init1 = ATZ Init2 = at+cgdcont=1,"ip","www" Stupid Mode = 1 [Dialer Airtel] Modem Type = Analog Modem Phone = *99# ISDN = 0 Baud = 115200 Username = airtel Password = airtel Modem = /dev/ttyO1 Init1 = ATZ Init2 = at+cgdcont=1,"ip","airtelgprs.com" Stupid Mode = 1
And run wvdial for the required service provider as follows:
wvdial airtel
A list of running commands should be visible on the shell, trying to establish PPP connection. Once PPP connection has been established, you will see a ppp0 IP. To check the status of wvdial and find out its IP open a new shell and use either of following:
- Run ifconfig and find ppp0 in the list of network connections.
$ ifconfig or $ ifconfig ppp0
- Check the network statistics for IP and their gateways and check the Iface column for ppp0
$ netstat -arn * Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.7.0 0.0.0.0 255.255.255.252 U 0 0 0 usb0 192.200.1.21 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
3. Read the system messages as
$ cat /var/log/messages
It lists all the attempts at establishing ppp communication using the modem and ips for the successful attempt. Now all that is left is to route the network traffic over the gateway of ppp0 instead of eth0 so that GPRS communication is fully completed.
For that, download and run this script
$ chmod +x 0000routefix $ ./0000routefix
Now on Ip table should look like this :
$ netstat -arn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.7.0 0.0.0.0 255.255.255.252 U 0 0 0 usb0 192.200.1.21 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0
PPP connection has been established over GPRS using 2G module and wvdial.
After PPP has been established, the following is the status of the LEDs and GPIOs 1. STATUS LED D3 – It is continuously glowing, once the Modem was turned on. 2. SIGNAL LED D4 – It is now blinking at 64ms ON/300ms OFF . Earlier when PPP was not established but SIMcard was detected by modem, then it was blinking at 64ms ON/3000ms OFF. 3. STATUS GPIO23 – Its value is be 1, once modem was turned on. 4. ON/OFF GPIO45 – Its value should be 1. 5. RESET GPIO60 – Its value should always be 1.
You can alternately run wvdial for multiple service providers and store their wvdial.conf files too by this way also
$ wvdial -C /etc/wvdial.conf.provider_name
where wvdial.conf.provider_name is wvdial.conf for the SIM card currently inserted. Also, you can Wvdial in background to free up the shell instead of opening another new shell by :
$ wvdial & disown
Sample Wvdial files for some service providers can be downloaded from below mentioned links :
1. Airtel, India 2. Vodafone, India 3. MTNL, India 4. Sample wvdial.conf with all above three providers in one file.
Adding a DNS if BBB doesnt get it
nano /etc/resolv.conf add following nameserver 8.8.8.8 nameserver 208.67.222.222
Using GPS module with Debian Wheezy
Please refer to Software startup Guide for VAYU GPS
Hardware and Software FAQ for Vayu Capes
- How to use the modem on this cape for establishing data connection?
Ans : Please refer to Application notes for configuring Cape for first time use and configuring for data connection using PPP/wvdial in debian wheezy or Angstrom.
- How to use the GPS module on this cape ?
Ans : Please refer to Application notes for Configuring Cape for first time use and GPS location and NTP Synchronization in Debian Wheezy or Angstrom.
- What are various applications of having GPS module on this cape? How can I use them ?
Ans : Please refer to Application note for GPS Location and NTP Synchronization in Debian Wheezy or Angstrom.
- How to set the PPP settings for a service provider ?
Ans : Please refer to Application note for Configuring for data connection using PPP/Wvdial in Debian Wheezy or Angstrom
- How to use the modem wtihWvdial ?
Ans : Please refer to Application note for Configuring for data connection using Wvdial in Debian Wheezy or Angstrom
- What all software patches do I need to use this cape ? Are there any images readily available to use it on the go ?
Ans : To use GPS Module completely, PPS drivers for GPIO enabled in kernel and NTP packages to be installed.
To use Modem, Wvdial and/or PPP files need to configured for establishing PPP connection.
All this is available in a Downloadable image for both Angstrom and Debian Wheezy as a normal SD card image or EMMC flasher image.
Kernel patch files are also available for use with pre-existing Debian/Angstrom Images and steps for compiling kernel for these drivers and installing packages are provided here. Please refer to Application notes for more details.
- Which all OS does the Cape support ? Can I use it with Android on Beaglebone Black ?
Ans: Currently Our Cape has full support on Debian Wheezy and Angstrom Linux. We are working to expand it for use with Android and other OS that Beaglebone Black supports.
- Cape/Modem was not Powered off when I shut Beaglebone Black down by pressing Power button or executing shutdown command ?
Ans: When Beaglebone Black is shutdown with Power adapter still plugged in then Modem just resets and turns back on because it draws power directly from Power Adapter and not the PMIC on Beaglebone Black.
So, usually when remotely shutting down Beaglebone Black, Turn off the Modem before that . Resetting Beagle bone Black resets the Modem in any case.
GPS module simply turns off when Beaglebone Black is shutdown.
- PPP is established, but I cannot access/login to Beaglebone Black over PPP IP ?
Ans : After establishing PPP connection and ensuring that it has been established properly, the Network Gateway on the Beaglebone black has to be switched from eth0 by default to the ppp0 .
It can be done using following commands :
GW=$(ip address show ppp0 | awk ‘/peer/ {print $4}’ | cut –d “/” –f1)
ip route replace default via $GW dev ppp0
You can simply replace the ‘GW’ by the Gateway ip for ppp0 too by looking from ifconfig output.
Now, check status of gateway being changed from eth0 to ppp0 by
netstat –arn
Similarly, you can reset back from ppp0 to eth0
- How to enable PPP redial when connection drops in between ?
Ans:
- What are the GPIOs for Resetting or turning ON/OFF the Modem and the GPS module?
Ans: For turning the Modem On or Off, GPIO 45 is used. GPIO45 should be high by default.
For Soft Resetting, cycle GPIO45 through OFF and then ON .
For Hard Resetting the modem, GPIO 60 is used. GPIO60 should be high by default
For Resetting the GPS module, GPIO50 is used. GPIO50 should be high by default.
There is no ON/OFF control for GPS Module.
Alternatively, push button switches can be used instead of GPIOs.
Please refer to Application notes for more information.
- At which port is GPS NMEA data coming?
Ans : GPS NMEA data is coming at UART4 or /dev/ttyO4 .
As a root user you can do the following :
stty –F /dev/ttyO4 19200 raw
cat /dev/ttyO4
or see the data over minicom at ttyO4 port.
- What are AT command settings for modem?
Ans : There is a AT command set available for the Modems . They can be downloaded from here.
AT command port for GPRS modem is /dev/ttyO1 at baud rate 115200 8N1.
- How to know whether PPP has been established successfully?
Ans : Please refer to Application note for Configuring Data connection using Wvdial/PPP for more details.
- How to see the NTP server data?
Ans : After starting NTP server, its data can be seen by using following query command :
ntpq –p
This would list all the peers that you have entered in your ntp.conf file.
- How to check that pps input data is coming ?
Ans: PPS inut data from GPS module is coming at /dev/pps1 after it has got a Fix . As a root user, follow these commands :
cd /usr/src/pps-tools
./ppstest /dev/pps1
The output should be something like this for a valid pps input
trying PPS source "/dev/pps1"
found PPS source "/dev/pps1"
ok, found 1 source(s), now start fetching data...
source 0 - assert 1392269685.015340936, sequence: 53 - clear 0.000000000, sequence: 0
source 0 - assert 1392269686.015346237, sequence: 54 - clear 0.000000000, sequence: 0
source 0 - assert 1392269687.015357137, sequence: 55 - clear 0.000000000, sequence: 0
- Can I use my own existing Debian image with this cape ? What extra files/software patches do I require to install?
Ans: Yes, you can use your own Debian/Angstrom image with our cape. You will need to include the precompiled kernel patches available from here and copy in your image as directed and reboot with the new image. It is advised to backup your existing image before doing this.
After applying kernel patches, follow application notes to configure the cape for establishing PPP connection or running a NTP server for time synchronization.
- What is the exact process to Turn Modem On and off and reset it using On/off switch or SW GPIOs ?
Ans: For turning the modem On or Off , GPIO 45 is used. Following is the process how it has to be used :
GPIO45 High, delay of 4 seconds, GPIO45 Low, delay of 4 seconds, GPIO45 High
GPIO45 should be High by default.
For soft resetting, cycle GPIO45 through OFF and then ON like following:
GPIO45 High, delay of 4 seconds, GPIO45 Low, delay of 4 seconds , GPIO45 High, delay of 4 seconds, GPIO45 Low, delay of 4 seconds, GPIO45 High
For Hard Resetting the modem, GPIO 60 is used. Following is the process:
GPIO60 Low, delay 1 second, GPIO60 High
GPIO60 should be high by default
For Resetting the GPS module, GPIO50 is used. Following is the process:
GPIO50 Low, delay 2 second, GPIO50 High
GPIO50 should be high by default.
Alternatively, Push button Switches can be used instead of GPIOs in similar cycles.
Please refer to Application notes for more information.
- What to do when the Modem hangs up ?
Ans : In cases when the Modem hangs up or its firmware stops responding to AT COMMANDS and cannot be turned OFF and then ON, Use Hard Reset.
Hard reset is advised to be used in such cases only otherwise prefer soft resets for minor aberrations.
- What is the process of resetting the GPS module ?
Ans: For reseting the GPS module, GPIO50 is used. Following is the process:
GPIO50 low, delay 2 second, GPIO50 High
GPIO50 should be high by default.
Alternatively, push button switch can be used instead of GPIO in similar cycle.
Please refer to Application notes for more information.
- If I remove the SIM card while Cape is still ON and replace it with a new SIM card, what should be done next ?
Ans : You will need to restart the modem ( OFF ON cycle).
- GPS module takes time to get GPS fix indoors, does the antenna need to outdoors always ?
Ans : Yes for best results, it is advised that GPS antennas be under open sky to get fast GPS Fix as per the hot start, warm start or cold start times. After GPS fix has been achieved, antenna can be moved indoors if required.
- On my Modem+ GPS cape, is there a way that either of the modules be used selectively ?
Ans : Yes , if you want that at some time only GPS module be used and not the Modem, you can either remove Power Jumper from the 5V supply or simply Turn the Modem OFF.
Similarly, to use only the Modem alone and not the GPS modem , you can pull down the GPIO50 which controls the reset input of GPS module.
- What is Power requirements of the cape ? How much Current is drawn by Modem and by GPS module ?
Ans : Modem + GPS version of Cape in active mode requires around 2A @5V.
Modem uses 1800mA@ 4V when data connection has been established and is being used.
GPS Module draws upto 50mA @3.3V.
Power usage values of Beaglebone black ranges 210-430 mA @5V as per its SRM.
- What is the recommended ratings of Power adapter to use with Cape ?
Ans : It is recommended to use atleast a 2.5A 5V power adapter with our cape for complete utilisation of all the functions of Beaglebone Black and our cape.
- What is the function of each LED ? What do they denote and how do they function under different conditions ?
Ans : D2 is power Led of Cape, which denotes the 5V power being provided to Cape and for the Modem.
D7 is 3.3V power LED from the Beaglebone Black. This denotes 3.3V power for GPS module and other ICs on Cape.
D5 is 1 PPS Fix led for the GPS module. It will blink at the rate of 1s, when GPS module has got its fix.
D4 is Netlight/Signal Led for the Modem. It has different behaviours depending on the state of Modem.
D3 is Status LED for the GPRS Modem. It gives the indication whether the GPRS Modem is on or not.
- What are the functions of the different Switches ?
Ans : S1 is ON/OFF push button switch for the Modem.
S2 is Hard Reset push Button switch for the Modem.
S3 is Reset push button switch for the GPS module.
S4 is 2 position DIP switch for specifying address for the EEPROM IC of cape on I2C2 bus of Beaglebone Black.
- How to use the audio from the Modem ?
Ans : Stereo audio/speaker and Mic ports are configured for the Modem. You need a surface mount type RJ9 4P4C connector to be mounted at P8 before a normal handset can be used.
Following part is recommended : Molex 95503-6451
- Which other capes are compatible with your cape ?
Ans : Please refer to this document for a current list of frequently queried compatibility of capes with our versions of cape. This list is constantly updated on query basis.
- Are there any extra Features on this cape ?
Ans: There is an Audio port available for use with the modem. The connector P8 needs to be mounted. (there is a four pin header P4 available outside of expansion header with UART2/I2C1 to possibly use with sensors or similar standalone applications ??)
- Are there any different functioning modes for the Modem ? Can it go to sleep when idle ? How to wake it up when its idle ?
Ans : There are different functioning modes for GPRS modem. Please refer to application note on device enable for 2G capes here.
- What is fanout of 1 PPS output signal ? Can it be reused other than from Beaglebone Black?
Ans :
- I used the USB cable to power on Beaglebone black with Cape on it, Beaglebone black did not boot properly, what is the issue?
Ans: USB cable alone cannot provide sufficient power(only500mA max) to drive the Beaglebone Black and Cape together , that is why it did not boot properly. Use a power adapter of 2.5A,5V rating to properly boot Beaglebone black with our cape.
- How to get in touch for an RMA ? What all information is required while applying for it ?
Ans : Please refer to our Warranty, Return and Support policy here . You can also contact our support for any queries regarding the same.
- How can I setup NTP server on beaglebone Black to use GPS data and PPS from GPS module of cape ?
Ans : Please refer to Application note for GPS Location and NTP Synchronization in Debian Wheezy or Angstrom.
- What is the meaning of data under different fields while querying NTP server information ?
Ans : Columns Defined:remote: peers speficified in the ntp.conf file* = current time source# = source selected, distance exceeds maximum valueo = source selected, Pulse Per Second (PPS) used+ = source selected, included in final setx = source false ticker. = source selected from end of candidate list- = source discarded by cluster algorithmblank = source discarded high stratum, failed sanity
refid: remote source’s synchronization source
stratum: stratum level of the source
t: types availablel = local (such as a GPS, WWVB)u = unicast (most common)m = multicastb = broadcast- = netaddr
when: number of seconds passed since last response
poll: polling interval, in seconds, for source
reach: indicates success/failure to reach source, 377 all attempts successful
delay: indicates the roundtrip time, in milliseconds, to receive a reply
offset: indicates the time difference, in milliseconds, between the client server and source
disp/jitter: indicates the difference, in milliseconds, between two samples
- Can the firmware of the modules be upgraded? Will there be any updates?
Ans : Yes the firmware of the modules can be upgraded. But we have chosen not to keep that option open ended. If there is any issue with the firmware of the modules (modem or GPS), please contact our support.
Trying to update or debug the firmware of the modules will likely be grounds for ceasing any support from us under warranty period.
