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

roberts_lando

TUTORIAL FIBOCOM G510 Unipi Neuron S103-G

Make the file-system writable:

mount / -o remount,rw
mount /boot -o remount,rw

Test the interface /dev/ttyAMA0 (serial link parameters: 115 200 1N8 Bps/Par/Bits)

Export pin 18

echo 18 >/sys/class/gpio/export

Switch on module

echo out > /sys/class/gpio/gpio18/direction
echo 1 > /sys/class/gpio/gpio18/value
echo 0 > /sys/class/gpio/gpio18/value
sleep 1
echo 1 > /sys/class/gpio/gpio18/value
sleep 2

Start the communication using cu

apt-get install cu
chown root:root /dev/ttyAMA0
cu -l /dev/ttyAMA0

Test: send sms (<Enter> means you have to press enter, OK is the output of the command)

AT  <Enter>
OK

AT+CMGF=1 <Enter>
OK

AT+CMGS="yourphonenumber" <Enter>
> Prova  <Ctrl+z>

+CMGS: 152
OK

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

~[unipi]. <Enter>

If interface doesn't works try:

Enable UART: nano /boot/cmdline.txt add (if not present) or edit this line: enable_uart=1. Close and save the file by typing Ctrl+X and Y. Reboot Unipi Neuron and retry to test the interface.

Now let's configure the interface for internet connection

Install required packages

apt-get update
apt-get install ppp screen elinks

Edit the configuration file (I use nano apt-get install nano)

cd /etc/ppp/peers/
nano rnet

Copy the code below to the new file

#configure for connection
connect "/usr/sbin/chat -v -f /etc/chatscripts/gprs -T <yourAPNhere>"
 
# Use /dev/ttyAMA0 as the communication port:
/dev/ttyAMA0
 
# Baudrate
9600
 
# Assumes that your IP address is allocated dynamically by the ISP.
noipdefault
 
# Try to get the name server addresses from the ISP.
usepeerdns
 
# Use this connection as the default route to the internet.
defaultroute
 
# Makes PPPD "dial again" when the connection is lost.
persist
 
# Do not ask the remote to authenticate.
noauth
 
# No hardware flow control on the serial link with GSM Modem
nocrtscts
 
# No modem control lines with GSM Modem
local

Replace <yourAPNhere> with your APN (Search in google APN of "your mobile operator") close and save the file by typing Ctrl+X and Y
If your SIM card has a PIN edit this file nano /etc/chatscripts/gprs un comment the line AT+CPIN=1234 and set the pin instead of 1234
Enable the connection by typing pon rnet. The show the log for PPPD type cat /var/log/syslog | grep pppd it will show if connection is established successfully.
Type ifconfig, now you should see another interface named ppp0.

0_1507015540134_upload-6607adf9-72d1-4cc9-97e2-cbe5b291b1c7

To close the connection type poff rnet

tomas_hora

@roberts_lando Great! Thanks a lot!

roberts_lando

@tomas_hora Just made a node-red Dashboard to get Modem Data :)

0_1507124912843_upload-f44d0f00-3612-47f8-aa08-91819d6ff5fe

0_1507124782319_upload-8a2171eb-31ce-403a-8b88-428e8162c1b4

With MNC MCC CellID and LAC it is also possible to get the location of the device by using https://opencellid.org/ APIs

oho

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

Does anyone know if it's possible to send AT commands from Mervis after turning on the modem first? Thanks.

tomas_hora

@oho Support of the GSM functionality will be available in Mervis in the next release.

unix

@roberts_lando hi iam new in node-red and S103-g my question is can you share your nice looking flow to learn better node-red.
regards

roberts_lando

@unix I have added it to node-red flows library: https://flows.nodered.org/flow/af6487676bd89e5e8b74b2c9da1e176d

Enjoy :)

unix

Nice thx for help :smile:
Regards

unix

Hi
i have inport your data but i get one error in debug
its "3.11.2017, 10:59:29node: parseModelIDfunction : (error)
"TypeError: Cannot read property 'trim' of undefined""

and the website looks like :
Daschboard
connect is green but no info i have only change the serial connect to
/dev/ttyAMA0: 115200-8n1

or i have problems whit the modem i can send the first sms whitout problems but after this only error when i test it whit cu -l /dev/ttyAMA0

hope for hints :smile:

Regards

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