diff --git a/cue-ios/CueIOS/AppState.swift b/cue-ios/CueIOS/AppState.swift
index be80fca..ca48bee 100644
--- a/cue-ios/CueIOS/AppState.swift
+++ b/cue-ios/CueIOS/AppState.swift
@@ -1,5 +1,6 @@
 import Foundation
 import Observation
+import Combine
 
 enum Tab: String, CaseIterable, Identifiable {
     case eis = "EIS"
@@ -16,6 +17,7 @@ enum Tab: String, CaseIterable, Identifiable {
 
 @Observable
 final class AppState {
+    let ble: BLEManager
     var tab: Tab = .eis
     var status: String = "Disconnected"
     var bleConnected: Bool = false
@@ -74,52 +76,255 @@ final class AppState {
     // Device reference collection
     var collectingRefs: Bool = false
     var hasDeviceRefs: Bool = false
+    private var eisRefs: [Int: [EisPoint]] = [:]
+    private var refMode: UInt8?
+    private var refRtia: UInt8?
+
+    // Session
+    var currentSessionId: Int64? = nil
 
     // Clean
     var cleanV: String = "1200"
     var cleanDur: String = "30"
 
+    // Temperature polling
+    private var tempTimer: Timer?
+
+    init() {
+        ble = BLEManager()
+        ble.setMessageHandler { [weak self] msg in
+            self?.handleMessage(msg)
+        }
+        startTempPolling()
+    }
+
+    // MARK: - BLE connection tracking
+
+    func updateConnectionState() {
+        let connected = ble.state == .connected
+        if connected != bleConnected {
+            bleConnected = connected
+            status = ble.state.rawValue
+        }
+    }
+
+    // MARK: - Temperature polling
+
+    private func startTempPolling() {
+        tempTimer = Timer.scheduledTimer(withTimeInterval: 0.5, repeats: true) { [weak self] _ in
+            guard let self, self.bleConnected else { return }
+            self.send(buildSysexGetTemp())
+        }
+    }
+
+    // MARK: - Send helper
+
+    func send(_ sysex: [UInt8]) {
+        ble.sendCommand(sysex)
+    }
+
+    // MARK: - Message handler
+
+    private func handleMessage(_ msg: EisMessage) {
+        switch msg {
+
+        case .sweepStart(let numPoints, let freqStart, let freqStop):
+            if collectingRefs {
+                eisPoints.removeAll()
+                sweepTotal = numPoints
+            } else {
+                eisPoints.removeAll()
+                sweepTotal = numPoints
+                status = String(format: "Sweep: %d pts, %.0f--%.0f Hz", numPoints, freqStart, freqStop)
+            }
+
+        case .dataPoint(_, let point):
+            eisPoints.append(point)
+            if !collectingRefs {
+                status = "Receiving: \(eisPoints.count)/\(sweepTotal)"
+            }
+
+        case .sweepEnd:
+            if collectingRefs {
+                if let r = refRtia, r < 8 {
+                    eisRefs[Int(r)] = eisPoints
+                }
+                eisPoints.removeAll()
+            } else {
+                saveEis()
+                status = "Sweep complete: \(eisPoints.count) points"
+            }
+
+        case .config(let cfg):
+            freqStart = String(format: "%.0f", cfg.freqStart)
+            freqStop = String(format: "%.0f", cfg.freqStop)
+            ppd = "\(cfg.ppd)"
+            rtia = cfg.rtia
+            rcal = cfg.rcal
+            electrode = cfg.electrode
+            status = "Config received"
+
+        case .lsvStart(let numPoints, let vStart, let vStop):
+            lsvPoints.removeAll()
+            lsvTotal = numPoints
+            status = String(format: "LSV: %d pts, %.0f--%.0f mV", numPoints, vStart, vStop)
+
+        case .lsvPoint(_, let point):
+            lsvPoints.append(point)
+            status = "LSV: \(lsvPoints.count)/\(lsvTotal)"
+
+        case .lsvEnd:
+            saveLsv()
+            status = "LSV complete: \(lsvPoints.count) points"
+
+        case .ampStart(let vHold):
+            ampPoints.removeAll()
+            ampRunning = true
+            status = String(format: "Amp: %.0f mV", vHold)
+
+        case .ampPoint(let index, let point):
+            ampPoints.append(point)
+            ampTotal = index + 1
+            status = "Amp: \(ampPoints.count) pts"
+
+        case .ampEnd:
+            ampRunning = false
+            saveAmp()
+            status = "Amp complete: \(ampPoints.count) points"
+
+        case .clStart(let numPoints):
+            clPoints.removeAll()
+            clResult = nil
+            clTotal = numPoints
+            status = "Chlorine: \(numPoints) pts"
+
+        case .clPoint(_, let point):
+            clPoints.append(point)
+            status = "Chlorine: \(clPoints.count)/\(clTotal)"
+
+        case .clResult(let r):
+            clResult = r
+            status = String(format: "Chlorine: free=%.3f uA, total=%.3f uA", r.iFreeUa, r.iTotalUa)
+
+        case .clEnd:
+            saveCl()
+            status = "Chlorine complete: \(clPoints.count) points"
+
+        case .phResult(let r):
+            if collectingRefs {
+                phRef = r
+            } else {
+                savePh(r)
+                status = String(format: "pH: %.2f (OCP=%.1f mV, T=%.1fC)", r.ph, r.vOcpMv, r.tempC)
+                phResult = r
+            }
+
+        case .temperature(let t):
+            tempC = t
+
+        case .refFrame(let mode, let rtiaIdx):
+            refMode = mode
+            refRtia = rtiaIdx
+            let modeName: String
+            switch mode {
+            case 0: modeName = "EIS"
+            case 1: modeName = "LSV"
+            case 2: modeName = "Amp"
+            case 3: modeName = "Cl"
+            case 4: modeName = "pH"
+            default: modeName = "?"
+            }
+            if mode == 0 {
+                status = "Ref: \(modeName) RTIA \(rtiaIdx + 1)/8"
+            } else {
+                status = "Ref: \(modeName) range search"
+            }
+
+        case .refLpRange:
+            break
+
+        case .refsDone:
+            collectingRefs = false
+            hasDeviceRefs = true
+            refMode = nil
+            refRtia = nil
+            let idx = Int(rtia.rawValue)
+            if idx < 8, let pts = eisRefs[idx] {
+                eisRef = pts
+            }
+            status = "Reference collection complete"
+
+        case .refStatus(let hasRefs):
+            hasDeviceRefs = hasRefs
+            if !hasRefs {
+                status = "No device refs"
+            }
+        }
+    }
+
     // MARK: - Actions
 
     func applyEISSettings() {
         let fs = Float(freqStart) ?? 1000
         let fe = Float(freqStop) ?? 200000
         let p = UInt16(ppd) ?? 10
-        status = "Applying: \(fs)-\(fe) Hz, \(p) PPD"
+        send(buildSysexSetSweep(freqStart: fs, freqStop: fe, ppd: p))
+        send(buildSysexSetRtia(rtia))
+        send(buildSysexSetRcal(rcal))
+        send(buildSysexSetElectrode(electrode))
+        send(buildSysexGetConfig())
     }
 
     func startSweep() {
         eisPoints.removeAll()
-        status = "Starting sweep..."
+        send(buildSysexGetTemp())
+        send(buildSysexStartSweep())
     }
 
     func startLSV() {
         lsvPoints.removeAll()
         let vs = Float(lsvStartV) ?? 0
         let ve = Float(lsvStopV) ?? 500
-        status = "Starting LSV: \(vs)-\(ve) mV"
+        let sr = Float(lsvScanRate) ?? 50
+        send(buildSysexGetTemp())
+        send(buildSysexStartLsv(vStart: vs, vStop: ve, scanRate: sr, lpRtia: lsvRtia))
     }
 
     func startAmp() {
         ampPoints.removeAll()
         ampRunning = true
-        status = "Starting amperometry..."
+        let vh = Float(ampVHold) ?? 200
+        let iv = Float(ampInterval) ?? 100
+        let dur = Float(ampDuration) ?? 60
+        send(buildSysexGetTemp())
+        send(buildSysexStartAmp(vHold: vh, intervalMs: iv, durationS: dur, lpRtia: ampRtia))
     }
 
     func stopAmp() {
-        ampRunning = false
-        status = "Stopping amperometry..."
+        send(buildSysexStopAmp())
     }
 
     func startChlorine() {
         clPoints.removeAll()
         clResult = nil
-        status = "Starting chlorine measurement..."
+        let vCond = Float(clCondV) ?? 800
+        let tCond = Float(clCondT) ?? 2000
+        let vFree = Float(clFreeV) ?? 100
+        let vTotal = Float(clTotalV) ?? -200
+        let tDep = Float(clDepT) ?? 5000
+        let tMeas = Float(clMeasT) ?? 5000
+        send(buildSysexGetTemp())
+        send(buildSysexStartCl(
+            vCond: vCond, tCondMs: tCond, vFree: vFree, vTotal: vTotal,
+            tDepMs: tDep, tMeasMs: tMeas, lpRtia: clRtia
+        ))
     }
 
     func startPh() {
         phResult = nil
-        status = "Starting pH measurement..."
+        let stab = Float(phStabilize) ?? 30
+        send(buildSysexGetTemp())
+        send(buildSysexStartPh(stabilizeS: stab))
     }
 
     func setReference() {
@@ -161,23 +366,31 @@ final class AppState {
 
     func collectRefs() {
         collectingRefs = true
+        eisRefs.removeAll()
         status = "Starting reference collection..."
+        send(buildSysexStartRefs())
+    }
+
+    func getRefs() {
+        collectingRefs = true
+        eisRefs.removeAll()
+        send(buildSysexGetRefs())
     }
 
     func clearRefs() {
         collectingRefs = false
         hasDeviceRefs = false
+        eisRefs.removeAll()
         eisRef = nil
-        lsvRef = nil
-        ampRef = nil
-        clRef = nil
         phRef = nil
+        send(buildSysexClearRefs())
         status = "Refs cleared"
     }
 
     func startClean() {
         let v = Float(cleanV) ?? 1200
         let d = Float(cleanDur) ?? 30
+        send(buildSysexStartClean(vMv: v, durationS: d))
         status = String(format: "Cleaning: %.0f mV for %.0fs", v, d)
     }
 
@@ -203,6 +416,93 @@ final class AppState {
         }
     }
 
+    // MARK: - Auto-save
+
+    private func saveEis() {
+        guard let sid = currentSessionId else { return }
+        let params: [String: String] = [
+            "freq_start": freqStart,
+            "freq_stop": freqStop,
+            "ppd": ppd,
+            "rtia": rtia.label,
+            "rcal": rcal.label,
+            "electrode": electrode.label,
+        ]
+        guard let configData = try? JSONEncoder().encode(params) else { return }
+        guard var meas = try? Storage.shared.addMeasurement(sessionId: sid, type: .eis) else { return }
+        meas.config = configData
+        guard let mid = meas.id else { return }
+        let indexed = eisPoints.enumerated().map { (index: $0.offset, value: $0.element) }
+        try? Storage.shared.addDataPoints(measurementId: mid, points: indexed)
+    }
+
+    private func saveLsv() {
+        guard let sid = currentSessionId else { return }
+        let params: [String: String] = [
+            "v_start": lsvStartV,
+            "v_stop": lsvStopV,
+            "scan_rate": lsvScanRate,
+            "rtia": lsvRtia.label,
+        ]
+        guard let configData = try? JSONEncoder().encode(params) else { return }
+        guard var meas = try? Storage.shared.addMeasurement(sessionId: sid, type: .lsv) else { return }
+        meas.config = configData
+        guard let mid = meas.id else { return }
+        let indexed = lsvPoints.enumerated().map { (index: $0.offset, value: $0.element) }
+        try? Storage.shared.addDataPoints(measurementId: mid, points: indexed)
+    }
+
+    private func saveAmp() {
+        guard let sid = currentSessionId else { return }
+        let params: [String: String] = [
+            "v_hold": ampVHold,
+            "interval_ms": ampInterval,
+            "duration_s": ampDuration,
+            "rtia": ampRtia.label,
+        ]
+        guard let configData = try? JSONEncoder().encode(params) else { return }
+        guard var meas = try? Storage.shared.addMeasurement(sessionId: sid, type: .amp) else { return }
+        meas.config = configData
+        guard let mid = meas.id else { return }
+        let indexed = ampPoints.enumerated().map { (index: $0.offset, value: $0.element) }
+        try? Storage.shared.addDataPoints(measurementId: mid, points: indexed)
+    }
+
+    private func saveCl() {
+        guard let sid = currentSessionId else { return }
+        let params: [String: String] = [
+            "cond_v": clCondV,
+            "cond_t": clCondT,
+            "free_v": clFreeV,
+            "total_v": clTotalV,
+            "dep_t": clDepT,
+            "meas_t": clMeasT,
+            "rtia": clRtia.label,
+        ]
+        guard let configData = try? JSONEncoder().encode(params) else { return }
+        guard var meas = try? Storage.shared.addMeasurement(sessionId: sid, type: .chlorine) else { return }
+        meas.config = configData
+        guard let mid = meas.id else { return }
+        let indexed = clPoints.enumerated().map { (index: $0.offset, value: $0.element) }
+        try? Storage.shared.addDataPoints(measurementId: mid, points: indexed)
+        if let r = clResult {
+            try? Storage.shared.setMeasurementResult(mid, result: r)
+        }
+    }
+
+    private func savePh(_ result: PhResult) {
+        guard let sid = currentSessionId else { return }
+        let params: [String: String] = [
+            "stabilize_s": phStabilize,
+        ]
+        guard let configData = try? JSONEncoder().encode(params) else { return }
+        guard var meas = try? Storage.shared.addMeasurement(sessionId: sid, type: .ph) else { return }
+        meas.config = configData
+        guard let mid = meas.id else { return }
+        try? Storage.shared.addDataPoint(measurementId: mid, index: 0, point: result)
+        try? Storage.shared.setMeasurementResult(mid, result: result)
+    }
+
     // MARK: - Measurement loading
 
     func loadMeasurement(_ measurement: Measurement) {
diff --git a/cue-ios/CueIOS/CueIOSApp.swift b/cue-ios/CueIOS/CueIOSApp.swift
index 07a8c00..6198e4a 100644
--- a/cue-ios/CueIOS/CueIOSApp.swift
+++ b/cue-ios/CueIOS/CueIOSApp.swift
@@ -2,11 +2,14 @@ import SwiftUI
 
 @main
 struct CueIOSApp: App {
-    @State private var ble = BLEManager()
+    @State private var state = AppState()
 
     var body: some Scene {
         WindowGroup {
-            ContentView()
+            ContentView(state: state)
+                .onReceive(Timer.publish(every: 0.25, on: .main, in: .common).autoconnect()) { _ in
+                    state.updateConnectionState()
+                }
         }
     }
 }
diff --git a/cue-ios/CueIOS/Views/ContentView.swift b/cue-ios/CueIOS/Views/ContentView.swift
index 41c9996..28e4c59 100644
--- a/cue-ios/CueIOS/Views/ContentView.swift
+++ b/cue-ios/CueIOS/Views/ContentView.swift
@@ -1,7 +1,7 @@
 import SwiftUI
 
 struct ContentView: View {
-    @State private var state = AppState()
+    @Bindable var state: AppState
     @Environment(\.horizontalSizeClass) private var sizeClass
 
     var body: some View {