Now, I finally can send SMS through the command line on an Android 8.0-oreo performing next steps:

 - Installing the ShellMS app on the phone (once for ever)
 - Going on the phone to Settings > Apps > ShellMS > Permissions > Enable all the permissions (once for ever)
 - Connecting the phone to the computer with USB
 - Issuing next script on the computer:

<pre>#!/bin/bash
phonenumber="$1"
message="$2"
# escape double quotes
message=${message//\"/\\\"} 
adb shell "am startservice --user 0 -n com.android.shellms/.sendSMS -e \"contact\" $phonenumber -e msg \"$message\""
</pre>