     ss1.put(NominalRadValve.cumulativeMovementSubSensor);
     // Show state of setback lockout.
     ss1.put(V0p2_SENSOR_TAG_F("gE"), OTRadValve::getSetbackLockout(), true);
+
+    // Show reset counter. Low priority.
+    ss1.put(V0p2_SENSOR_TAG_F("R"), resetCount, true);
+    // Send minimum stack left, saturating at 255 bytes.
+    const size_t curMinSP = OTV0P2BASE::MemoryChecks::getMinSP();
+    const uint8_t txMinSP = (255U >= curMinSP) ? (uint8_t) curMinSP : 255U;
+    ss1.put(V0p2_SENSOR_TAG_F("SP"), txMinSP, true);
+
+
     const uint8_t privacyLevel = OTV0P2BASE::stTXalwaysAll;
     // Redirect JSON output appropriately.
     // Part of sW, directly after the message buffer.

    // Initialise sensors with stats info where needed.
    updateSensorsFromStats();

    OTV0P2BASE::MemoryChecks::resetMinSP();  // XXX
    OTV0P2BASE::MemoryChecks::recordIfMinSP(1);
    stackCheck();

    // Do early 'wake-up' stats transmission if possible // XXX
    // when everything else is set up and ready and allowed (TODO-636)
    // including all set-up and inter-wiring of sensors/actuators.

            // Reset or display ID.
            case 'I': { OTV0P2BASE::CLI::NodeIDWithSet().doCommand(buf, n); break; }
            // Status line stats print and TX.
//            case 'S': {
//                Serial.print(F("Resets: "));
//                const uint8_t resetCount = eeprom_read_byte((uint8_t *)V0P2BASE_EE_START_RESET_COUNT);
//                Serial.print(resetCount);
//                Serial.println();
//                // Show stack headroom.
//                OTV0P2BASE::serialPrintAndFlush(F("SH ")); OTV0P2BASE::serialPrintAndFlush(OTV0P2BASE::MemoryChecks::getMinSPSpaceBelowStackToEnd()); OTV0P2BASE::serialPrintlnAndFlush();
//                // Default light-weight print and TX of stats.
////                bareStatsTX();  // FIXME No way this won't overflow!
//                break; // Note that status is by default printed after processing input line.
//            }
            // Switch to FROST mode OR set FROST/setback temperature (even with temp pot available).
            // With F! force to frost and holiday (long-vacant) mode.  Useful for testing and for remote CLI use.
            case 'F': {
