(CRON) info (No MTA installed, discarding output) sent message telegram - bash

Question

i'm make a new shell script crontab notify to telegram but the message doesn't received
environment
ubuntu 16.04
uname -n >> text.txt
while read p; do
adb -s "$p" shell getprop ro.product.manufacturer >> text.txt
adb -s "$p" shell dumpsys battery | grep level >> text.txt
adb -s "$p" shell getprop ro.product.model >> text.txt
adb -s "$p" shell dumpsys battery | grep health >> text.txt
TEXT=$(cat text.txt)
curl -X POST https://api.telegram.org/bot<token>/sendMessage -d chat_id=<chat id> -d text="$TEXT"
rm text.txt
done <info.txt
i expect the message can be received in telegram
this log cron
cron.service - Regular background program processing daemon
Loaded: loaded (/lib/systemd/system/cron.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2019-03-25 17:53:44 WIB; 11min ago
Docs: man:cron(8)
Main PID: 14599 (cron)
Tasks: 1
Memory: 3.3M
CPU: 229ms
CGroup: /system.slice/cron.service
└─14599 /usr/sbin/cron -f
Mar 25 18:02:01 -Latitude-3490 CRON[14811]: pam_unix(cron:session): session opened for user root by (uid=0)
Mar 25 18:02:01 -Latitude-3490 CRON[14812]: (root) CMD (sh /home/asd/device_info.sh)
Mar 25 18:02:01 -Latitude-3490 CRON[14811]: pam_unix(cron:session): session closed for user root
Mar 25 18:03:01 -Latitude-3490 CRON[14857]: pam_unix(cron:session): session opened for user root by (uid=0)
Mar 25 18:03:01 -Latitude-3490 CRON[14858]: (root) CMD (sh /home/asd/device_info.sh)
Mar 25 18:03:01 -Latitude-3490 CRON[14857]: pam_unix(cron:session): session closed for user root
Mar 25 18:04:01 -Latitude-3490 CRON[14866]: pam_unix(cron:session): session opened for user root by (uid=0)
Mar 25 18:04:01 -Latitude-3490 CRON[14867]: (root) CMD (sh /home/asd/device_info.sh)
Mar 25 18:05:01 -Latitude-3490 CRON[14879]: pam_unix(cron:session): session opened for user root by (uid=0)
Mar 25 18:05:01 -Latitude-3490 CRON[14880]: (root) CMD (sh /home/asd/device_info.sh)

Answer 1

first of all see: https://unix.stackexchange.com/a/150556
this is quick issue for your case.
for one mobile device serial number:
#!/bin/bash
SERIAL="XX-XXXXXXXXXXXXXXXXXXXXXXXX"
TOKEN="XXXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
CHATID="XXXXXXXXX"
# stuff
MSG="*server hostname:*
$(uname -n)
*mobile device info:*
$(adb -s "$SERIAL" shell getprop ro.product.manufacturer)
$(adb -s "$SERIAL" shell getprop ro.product.model)
$(adb -s "$SERIAL" shell dumpsys battery | grep -Eo '(level|health).*' )"
curl -s https://api.telegram.org/bot"$TOKEN"/sendMessage \
-d "chat_id=$CHATID&text=$MSG&parse_mode=markdown" > /dev/null
# end stuff
for whitespace separated serials in devices.txt file you should add
...
for SERIAL in $(cat devices.txt)
do
# stuff
...
...
# end stuff
done
add job to crontab
* * * * * exec /root/get_device_info
result: