S103-G use GSM/GPRS module to connect to internet

roberts_lando

@unix Did you close the connection after using cu? Cause that error means that I call .trim() in an undefined var (modelID) that means no data is received after the command. Each command has a timeout, after that I close the read stream from the serial and I try to parse the response string, if the response string is not well parsed those errors are normal, try to put a debug node to see the output of the serial and check that the cu session is closed.

Disconnect: type ~ (alt+126) than wait for [unipi] output than type . and hit <Enter>

unix

Hi
yes the cu session a closed in debug i see this

3.11.2017, 11:25:11node: 96ac4186.358femsg.payload : string[4]
"OK↵"
3.11.2017, 11:25:13node: 96ac4186.358femsg.payload : string[11]
"AT+COPS? ↵"
3.11.2017, 11:25:13node: 96ac4186.358femsg.payload : string[17]
"+COPS: 0,0,"A1"↵"
3.11.2017, 11:25:13node: 96ac4186.358femsg.payload : string[2]
"↵"
3.11.2017, 11:25:13node: 96ac4186.358femsg.payload : string[4]
"OK↵"
3.11.2017, 11:25:14node: parseOperatorfunction : (error)
"TypeError: Cannot read property 'trim' of undefined"
3.11.2017, 11:25:15node: 96ac4186.358femsg.payload : string[10]
"AT+CGMI ↵"
3.11.2017, 11:25:15node: 96ac4186.358femsg.payload : string[18]
"+CGMI: "Fibocom"↵"
3.11.2017, 11:25:15node: 96ac4186.358femsg.payload : string[2]
"↵"
3.11.2017, 11:25:15node: 96ac4186.358femsg.payload : string[4]
"OK↵"
3.11.2017, 11:25:17node: 96ac4186.358femsg.payload : string[10]
"AT+CGMM ↵"
3.11.2017, 11:25:17node: 96ac4186.358femsg.payload : string[38]
"+CGMM: "GSM850/900/1800/1900","G510"↵"
3.11.2017, 11:25:17node: 96ac4186.358femsg.payload : string[2]
"↵"
3.11.2017, 11:25:17node: 96ac4186.358femsg.payload : string[4]
"OK↵"
3.11.2017, 11:25:18node: parseModelIDfunction : (error)
"TypeError: Cannot read property 'trim' of undefined"

Regards

roberts_lando

@unix I haven't the possibility to debug it right now, as your debug shows the commands are correctly received, I think you have to change the serial in-out configuration. Check it and send me a screenshot of both.

Also try to put a debug node after join node wired with serial-out

unix

@roberts_lando
i have found one error in another flow i have running sms sender i have delete this and the error seems only the trim see screenshots.

1 alt text
2
3

Regards

i have check the modem connect over cu and modem works and i disconnect to the modem.

roberts_lando

@unix ok I have found the problem: replace \n with \r\n in both serial-in and serial-out nodes than it should work correctly! This has happen because when you have imported the flow I think you haven't already installed node-red-node-serial and the configuration got lost

unix

@roberts_lando

WTF great thx for fast response and help :smile:

regards

roberts_lando

@unix you welcome! :)

Vesa Kauppinen

@roberts_lando said in S103-G use GSM/GPRS module to connect to internet:

Hi!

Great tutorial!

I use Raspbian Stretch Lite and I can not get the S103-G to work with these instructions. The command cu -l / dev / ttyAMA0 crashes when I try to AT command. Ifconfig does not give ppp0.

What have I missed?

Vesa

unix

@Vesa-Kauppinen
Hi
have you disable the BT on Pi3

/boot/config.txt addline

dtoverlay=pi3-disable-bt

and on /boot/cmdline.txt remove

serial console than its looks like

dwc_otg.lpm_enable=0 console=tty1 root=PARTUUID=e13fdf55-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait

Regards

Vesa Kauppinen

@unix

Thank you for answer!

BT disabled and cmdline.txt edited...

No success

@tomas_hora any ideas?

Vesa

roberts_lando

I always had compatibility problems when using Raspbian Stretch, try to use last Raspbian Jessie img and it should work

Vesa Kauppinen

@roberts_lando

Thank you for answer!

Now i have tried with Rasbian Jessie Lite.....no success :disappointed:

Do you use Jessie Lite or full?

Thanks,
Vesa

roberts_lando

@Vesa-Kauppinen I think you have missed one or more step of the turorial. I suggest you to retry the tutorial and check if an instruction fails. Do you have switch on the GPRS module?

mattia98

@roberts_lando Hi, I've done all the steps to configure the internet connection but when I type "ifconfig" it doesn't show me the ppp0 interface. Could you please help me?

when I type the command "cat /var/log/syslog" It show me this messages:

Sep 4 13:41:52 raspberrypi pppd[1698]: pppd 2.4.7 started by root, uid 0
Sep 4 13:41:52 raspberrypi chat[1702]: abort on (BUSY)
Sep 4 13:41:52 raspberrypi chat[1702]: abort on (VOICE)
Sep 4 13:41:52 raspberrypi chat[1702]: abort on (NO CARRIER)
Sep 4 13:41:52 raspberrypi chat[1702]: abort on (NO DIALTONE)
Sep 4 13:41:52 raspberrypi chat[1702]: abort on (NO DIAL TONE)
Sep 4 13:41:52 raspberrypi chat[1702]: abort on (NO ANSWER)
Sep 4 13:41:52 raspberrypi chat[1702]: abort on (DELAYED)
Sep 4 13:41:52 raspberrypi chat[1702]: abort on (ERROR)
Sep 4 13:41:52 raspberrypi chat[1702]: abort on (+CGATT: 0)
Sep 4 13:41:52 raspberrypi chat[1702]: send (AT^M)
Sep 4 13:41:52 raspberrypi chat[1702]: timeout set to 12 seconds
Sep 4 13:41:52 raspberrypi chat[1702]: expect (OK)
Sep 4 13:42:04 raspberrypi chat[1702]: alarm
Sep 4 13:42:04 raspberrypi chat[1702]: Failed
Sep 4 13:42:04 raspberrypi pppd[1698]: Connect script failed
Sep 4 13:42:10 raspberrypi OWFS[477]: DEFAULT: ow_reconnect.c:(72) DS2482-100 bus master reconnected
Sep 4 13:42:30 raspberrypi OWFS[477]: DEFAULT: ow_reconnect.c:(72) DS2482-100 bus master reconnected

tomas_hora

The issue was by the incorrect comm speed with the modem. I modified the guide provided by @roberts_lando to use the proper baudrate of 9600 instead of 115200.