How to "Enable mobile data" on a Huawei E3372 4G USB dongle using a bash script in Windows

!! EDIT: a solution can be found at the bottom of the question !!

I am using a Huawei E3372 4G USB dongle on Win8.1. This dongle's settings can be accessed via browser by typing 192.168.8.1 and the user can enable a 4G connection by manually clicking the "Enable mobile data" button.

This is the script I am trying to use to "Enable mobile data" connection, knowing I'm doing something wrong only on line 4:

#!/bin/bash

curl -s -X GET "http://192.168.8.1/api/webserver/token" > token.xml
TOKEN=$(grep -v '<?xml version="1.0" encoding="UTF-8"?><response><token>' -v '</token></response>' token.xml)

curl "http://192.168.8.1/api/dialup/mobile-dataswitch" -H "Host: 192.168.8.1" -H "User-Agent: Mozilla/5.0 (Windows NT 6.3; rv:68.0) Gecko/20100101 Goanna/4.8 Firefox/68.0 PaleMoon/29.0.1" -H "Accept: */*" -H "Accept-Language: en-US,en;q=0.5" --compressed -H "Content-Type: application/x-www-form-urlencoded; charset=UTF-8;" -H "_ResponseSource: Broswer" -H "__RequestVerificationToken: $TOKEN" -H "X-Requested-With: XMLHttpRequest" -H "Referer: http://192.168.8.1/html/content.html" -H "Cookie: SessionID=AgVjkIjBxOC0xPbys3nne7rA4I8GXNzUkZCcSOGPR8P3xss8XOuqRbdb0EgHidXhQXZ903xf0nk0F8J81ISqHpZ7kYvZaSW5wHWDqJ9w90pXj90cPwCm7F01fFcmp0gv" -H "Connection: keep-alive" --data-raw "<?xml version=""1.0"" encoding=""UTF-8""?><request><dataswitch>1</dataswitch></request>"

date
exec $SHELL

Upon executing the first curl command, the xml file's content would look like this:

<?xml version="1.0" encoding="UTF-8"?><response><token>ZsxY7Q9G90jh4FqUiAjxD9XmqLWf0rYg4RUNf6FoVzeTIlPPms0Ov1RERFFRY77o</token></response>

Just for test purposes, if I manually insert the token in the bash script, it works like a charm:

#!/bin/bash

curl "http://192.168.8.1/api/dialup/mobile-dataswitch" -H "Host: 192.168.8.1" -H "User-Agent: Mozilla/5.0 (Windows NT 6.3; rv:68.0) Gecko/20100101 Goanna/4.8 Firefox/68.0 PaleMoon/29.0.1" -H "Accept: */*" -H "Accept-Language: en-US,en;q=0.5" --compressed -H "Content-Type: application/x-www-form-urlencoded; charset=UTF-8;" -H "_ResponseSource: Broswer" -H "__RequestVerificationToken: ZsxY7Q9G90jh4FqUiAjxD9XmqLWf0rYg4RUNf6FoVzeTIlPPms0Ov1RERFFRY77o" -H "X-Requested-With: XMLHttpRequest" -H "Referer: http://192.168.8.1/html/content.html" -H "Cookie: SessionID=AgVjkIjBxOC0xPbys3nne7rA4I8GXNzUkZCcSOGPR8P3xss8XOuqRbdb0EgHidXhQXZ903xf0nk0F8J81ISqHpZ7kYvZaSW5wHWDqJ9w90pXj90cPwCm7F01fFcmp0gv" -H "Connection: keep-alive" --data-raw "<?xml version=""1.0"" encoding=""UTF-8""?><request><dataswitch>1</dataswitch></request>"

date
exec $SHELL

I've found several suggestions for the same or similar dongles, none of them worked for me, it must be due to my insufficient knowledge. My cry for help is about line 4 of the top-most script. I am making a mistake somewhere obviously.

Thank you in advance for your help.

===== EDIT: SOLUTION IS FOUND ! =====

markp-fuso's suggestion was the path to my solution. Kudos. I just noticed that besides a variable "token" which was changing upon each "on/off" action, this dongle also had a less variable "SesTokInfo" which is not being changed upon each "on/off" action (I just tested that manually) and it is different than what it was yesterday. It could be "plug/unplug" of dongle that causes that, I honestly can't know.

To whom it may concern: The final form of the working script which I've just tested with positive result twice would be: (note that the script contains the curl command to "Enable mobile data". The one to "Disable mobile data" should contain 0 instead of 1 in the "dataswitch>1</dataswitch" part.

#!/bin/bash

curl -s -X GET "http://192.168.8.1/api/webserver/token" > token.xml
curl -s -X GET "http://192.168.8.1/api/webserver/SesTokInfo" > sestoken.xml
TOKEN=$(sed -En 's|.*<token>(.*)</token>.*|\1|p' token.xml)
SESTOKEN=$(sed -En 's|.*<SesInfo>(.*)</SesInfo>.*|\1|p' sestoken.xml)
typeset -p TOKEN
typeset -p SESTOKEN

curl "http://192.168.8.1/api/dialup/mobile-dataswitch" -H "Host: 192.168.8.1" -H "User-Agent: Mozilla/5.0 (Windows NT 6.3; rv:68.0) Gecko/20100101 Goanna/4.8 Firefox/68.0 PaleMoon/29.0.1" -H "Accept: */*" -H "Accept-Language: en-US,en;q=0.5" --compressed -H "Content-Type: application/x-www-form-urlencoded; charset=UTF-8;" -H "_ResponseSource: Broswer" -H "__RequestVerificationToken: $TOKEN" -H "X-Requested-With: XMLHttpRequest" -H "Referer: http://192.168.8.1/html/content.html" -H "Cookie: SessionID=$SESTOKEN" -H "Connection: keep-alive" --data-raw "<?xml version=""1.0"" encoding=""UTF-8""?><request><dataswitch>1</dataswitch></request>"

date
exec $SHELL

Solution

When I run your grep -v ... -v ... token.xml call I get an error:

$ grep -v '<?xml version="1.0" encoding="UTF-8"?><response><token>' -v '</token></response>' token.xml
grep: </token></response>: No such file or directory

After TOKEN has been populated I recommend you add typeset -p TOKEN (to show the contents of TOKEN); I'm guessing TOKEN does not contain what you think it does.

While xml should probably be parsed by a xml-capable tool, if you are 100% sure of the format of the contents in token.xml then the following should extract the token for you:

$ sed -En 's|.*<token>(.*)</token>.*|\1|p' token.xml
ZsxY7Q9G90jh4FqUiAjxD9XmqLWf0rYg4RUNf6FoVzeTIlPPms0Ov1RERFFRY77o

Then update your script with the following TOKEN=$(...) line:

$ TOKEN=$(sed -En 's|.*<token>(.*)</token>.*|\1|p' token.xml)
$ typeset -p TOKEN
declare -- TOKEN="ZsxY7Q9G90jh4FqUiAjxD9XmqLWf0rYg4RUNf6FoVzeTIlPPms0Ov1RERFFRY77o"