jenkinsfile - watch screen test 7h new ssh method

api/Jenkinsfile.ble_test

@@ -92,7 +92,7 @@ pipeline {
                             while screen -list | grep -q "ble_test_${TEST_HASH}"; do
                                 # Tail the file and flush each line immediately
                                 tail -n +1 -f "/tmp/ble_test_${env.TEST_HASH}.log" | while IFS= read -r line; do
-                                    echo "$line"
+                                    printf '%s\n' "$line"
                                 done
                             done
                             EOF