Based on the Satcharitra, what was the purpose of the constantly burning Dhuni in the Masjid, and what did Baba do with the firewood he collected?

Chapter 33 describes Sai Baba's routine of collecting firewood, sometimes by purchasing surplus bundles, and piling the logs up. He would then offer these dry logs into the sacred Dhuni, the fire that was kept constantly burning in the Masjid. The primary purpose of this was to produce a great quantity of sacred ash, or Udi. This Udi was not merely a byproduct but the very goal of the process. As detailed in the chapter, Baba would then apply this Udi to his devotees, making the perpetually burning Dhuni the sacred source of the blessed ash used for his spiritual teachings and blessings.