Don't recreate string for every ping

[Olegt0rr]

What do these changes do?

Create ping message once, not for every ping.

Are there changes in behavior for the user?

No changes

Related issue number

No issues

Checklist

• [x] I think the code is well written
• [x] Unit tests for the changes exist
• [x] Documentation reflects the changes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (ae2581b) 100.00% compared to head (589d991) 100.00%. Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #467 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 4 4 Lines 474 475 +1 Branches 54 54 ========================================= + Hits 474 475 +1 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.