From 35a76fe52cc2a53203b6a5c4abb006c7a3c2c55f Mon Sep 17 00:00:00 2001
From: Colin Dawson <me@cjdawson.com>
Date: Sun, 8 May 2022 11:52:45 +0000
Subject: [PATCH] Merged in feature/PortSpeed (pull request #40)

Feature/PortSpeed

* Added support for changing the speed of the autostar

* Added support for changing the speed of the autostar

* Merge remote-tracking branch 'origin/feature/PortSpeed' into feature/PortSpeed

* Upgraded unit testing to make sure that speed changes are properly tested
---
 .../Meade.net.Telescope.csproj                |   4 +
 .../SharedResourcesUnitTests.cs               | 343 ++++++++++++++++++
 Meade.net/SetupDialogForm.cs                  |  25 +-
 Meade.net/SharedResources.cs                  |  83 ++++-
 4 files changed, 449 insertions(+), 6 deletions(-)

diff --git a/Meade.net.Telescope/Meade.net.Telescope.csproj b/Meade.net.Telescope/Meade.net.Telescope.csproj
index f51673b..e37c209 100644
--- a/Meade.net.Telescope/Meade.net.Telescope.csproj
+++ b/Meade.net.Telescope/Meade.net.Telescope.csproj
@@ -194,6 +194,10 @@
     <PreBuildEvent>
     </PreBuildEvent>
   </PropertyGroup>
+  <PropertyGroup>
+    <PostBuildEvent>
+    </PostBuildEvent>
+  </PropertyGroup>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it.
        Other similar extension points exist, see Microsoft.Common.targets.
   <Target Name="BeforeBuild">
diff --git a/Meade.net.UnitTests/SharedResourcesUnitTests.cs b/Meade.net.UnitTests/SharedResourcesUnitTests.cs
index 30582f1..c0e8442 100644
--- a/Meade.net.UnitTests/SharedResourcesUnitTests.cs
+++ b/Meade.net.UnitTests/SharedResourcesUnitTests.cs
@@ -590,6 +590,349 @@ namespace Meade.net.UnitTests
             }
         }
 
+        [Test]
+        public void Connect_WhenSpeedIsFastAndAutostarSetToFast_ThenConnectsDirectlyAtFastSpeed()
+        {
+            string deviceId = "Serial";
+
+            string DriverId = "ASCOM.MeadeGeneric.Telescope";
+
+            string TraceStateDefault = "false";
+
+            string ComPortDefault = "COM1";
+            string SpeedDefault = "57600";
+            string DataBitsDefault = "8";
+            string StopBitsDefault = "One";
+            string HandshakeDefault = "None";
+            string ParityDefault = "None";
+            string RtsDtrEnabledDefault = "false";
+
+            string GuideRateProfileNameDefault = "10.077939"; //67% of sidereal rate
+            string PrecisionDefault = "Unchanged";
+
+            string ParkedBehaviourDefault = "No Coordinates";
+            string ParkedAltDefault = "0";
+            string ParkedAzimuthDefault = "180";
+            string FocalLengthDefault = "2000";
+            string ApertureAreaDefault = "32685";
+            string ApertureDiameterDefault = "203";
+
+            Mock<IProfileWrapper> profileWrapperMock = new Mock<IProfileWrapper>();
+            profileWrapperMock.SetupAllProperties();
+
+            profileWrapperMock.Setup(x => x.GetValue(DriverId, "Trace Level", string.Empty, TraceStateDefault))
+                .Returns(TraceStateDefault);
+            profileWrapperMock.Setup(x => x.GetValue(DriverId, "COM Port", string.Empty, ComPortDefault))
+                .Returns(ComPortDefault);
+            profileWrapperMock
+                .Setup(x => x.GetValue(DriverId, "Guide Rate Arc Seconds Per Second", string.Empty,
+                    GuideRateProfileNameDefault)).Returns(GuideRateProfileNameDefault);
+            profileWrapperMock.Setup(x => x.GetValue(DriverId, "Precision", string.Empty, PrecisionDefault))
+                .Returns(PrecisionDefault);
+            profileWrapperMock.Setup(x =>
+               x.GetValue(DriverId, "Speed", string.Empty, SpeedDefault))
+                   .Returns(() => SpeedDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Data Bits", string.Empty, DataBitsDefault))
+                .Returns(() => DataBitsDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Stop Bits", string.Empty, StopBitsDefault))
+                .Returns(() => StopBitsDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Hand Shake", string.Empty, HandshakeDefault))
+                .Returns(() => HandshakeDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Parity", string.Empty, ParityDefault))
+                .Returns(() => ParityDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Rts / Dtr", string.Empty, RtsDtrEnabledDefault))
+                .Returns(() => RtsDtrEnabledDefault);
+
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Parked Behaviour", string.Empty, ParkedBehaviourDefault))
+                .Returns(() => ParityDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Parked Altitude", string.Empty, ParkedAltDefault))
+                .Returns(() => ParkedAltDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Parked Azimuth", string.Empty, ParkedAzimuthDefault))
+                .Returns(() => ParkedAzimuthDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Focal Length (mm)", string.Empty, FocalLengthDefault))
+                .Returns(() => FocalLengthDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Aperture Area (mm²)", string.Empty, ApertureAreaDefault))
+                .Returns(() => ApertureAreaDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Aperture Diameter (mm)", string.Empty, ApertureDiameterDefault))
+                .Returns(() => ApertureDiameterDefault);
+
+            Mock<IProfileFactory> profileFactoryMock = new Mock<IProfileFactory>();
+            profileFactoryMock.Setup(x => x.Create()).Returns(profileWrapperMock.Object);
+
+            SharedResources.ProfileFactory = profileFactoryMock.Object;
+
+            string serialPortReturn = string.Empty;
+
+            _serialMock.Setup(x => x.Transmit("#:GVP#")).Callback(() => { serialPortReturn = TelescopeList.LX200GPS; });
+            _serialMock.Setup(x => x.Transmit("#:GVN#")).Callback(() => { serialPortReturn = TelescopeList.LX200GPS_42G; });
+            _serialMock.Setup(x => x.Transmit("#:GG#")).Callback(() => { serialPortReturn = "0"; });
+            _serialMock.Setup(x => x.ReceiveTerminated("#")).Returns(() => serialPortReturn);
+
+            var connectionResult = SharedResources.Connect(deviceId, string.Empty, _traceLoggerMock.Object);
+            try
+            {
+                Assert.That(connectionResult.SameDevice, Is.EqualTo(1));
+                Assert.That(SharedResources.ProductName, Is.EqualTo(TelescopeList.LX200GPS));
+                Assert.That(SharedResources.FirmwareVersion, Is.EqualTo(TelescopeList.LX200GPS_42G));
+            }
+            finally
+            {
+                SharedResources.Disconnect(deviceId, String.Empty);
+            }
+        }
+
+        [TestCase("57600")]
+        [TestCase("38400")]
+        [TestCase("28800")]
+        [TestCase("19200")]
+        [TestCase("14400")]
+        [TestCase("4800")]
+        [TestCase("2400")]
+        [TestCase("1200")]
+        public void Connect_WhenSpeedIsFastAndAutostarAtDefault_ThenConnectsAutoStarSpeedChanged(string WantedSpeed)
+        {
+            string deviceId = "Serial";
+
+            string DriverId = "ASCOM.MeadeGeneric.Telescope";
+
+            string TraceStateDefault = "false";
+
+            string ComPortDefault = "COM1";
+            string SpeedDefault = "9600";
+            string DataBitsDefault = "8";
+            string StopBitsDefault = "One";
+            string HandshakeDefault = "None";
+            string ParityDefault = "None";
+            string RtsDtrEnabledDefault = "false";
+
+            string GuideRateProfileNameDefault = "10.077939"; //67% of sidereal rate
+            string PrecisionDefault = "Unchanged";
+
+            string ParkedBehaviourDefault = "No Coordinates";
+            string ParkedAltDefault = "0";
+            string ParkedAzimuthDefault = "180";
+            string FocalLengthDefault = "2000";
+            string ApertureAreaDefault = "32685";
+            string ApertureDiameterDefault = "203";
+
+            Mock<IProfileWrapper> profileWrapperMock = new Mock<IProfileWrapper>();
+            profileWrapperMock.SetupAllProperties();
+
+            profileWrapperMock.Setup(x => x.GetValue(DriverId, "Trace Level", string.Empty, TraceStateDefault))
+                .Returns(TraceStateDefault);
+            profileWrapperMock.Setup(x => x.GetValue(DriverId, "COM Port", string.Empty, ComPortDefault))
+                .Returns(ComPortDefault);
+            profileWrapperMock
+                .Setup(x => x.GetValue(DriverId, "Guide Rate Arc Seconds Per Second", string.Empty,
+                    GuideRateProfileNameDefault)).Returns(GuideRateProfileNameDefault);
+            profileWrapperMock.Setup(x => x.GetValue(DriverId, "Precision", string.Empty, PrecisionDefault))
+                .Returns(PrecisionDefault);
+            profileWrapperMock.Setup(x =>
+               x.GetValue(DriverId, "Speed", string.Empty, SpeedDefault))
+                   .Returns(() => WantedSpeed);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Data Bits", string.Empty, DataBitsDefault))
+                .Returns(() => DataBitsDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Stop Bits", string.Empty, StopBitsDefault))
+                .Returns(() => StopBitsDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Hand Shake", string.Empty, HandshakeDefault))
+                .Returns(() => HandshakeDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Parity", string.Empty, ParityDefault))
+                .Returns(() => ParityDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Rts / Dtr", string.Empty, RtsDtrEnabledDefault))
+                .Returns(() => RtsDtrEnabledDefault);
+
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Parked Behaviour", string.Empty, ParkedBehaviourDefault))
+                .Returns(() => ParityDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Parked Altitude", string.Empty, ParkedAltDefault))
+                .Returns(() => ParkedAltDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Parked Azimuth", string.Empty, ParkedAzimuthDefault))
+                .Returns(() => ParkedAzimuthDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Focal Length (mm)", string.Empty, FocalLengthDefault))
+                .Returns(() => FocalLengthDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Aperture Area (mm²)", string.Empty, ApertureAreaDefault))
+                .Returns(() => ApertureAreaDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Aperture Diameter (mm)", string.Empty, ApertureDiameterDefault))
+                .Returns(() => ApertureDiameterDefault);
+
+            Mock<IProfileFactory> profileFactoryMock = new Mock<IProfileFactory>();
+            profileFactoryMock.Setup(x => x.Create()).Returns(profileWrapperMock.Object);
+
+            SharedResources.ProfileFactory = profileFactoryMock.Object;
+
+            string serialPortReturn = string.Empty;
+
+            _serialMock.Setup(x => x.Transmit("#:GVP#")).Callback(() => { serialPortReturn = TelescopeList.LX200GPS; });
+            _serialMock.Setup(x => x.Transmit("#:GVN#")).Callback(() => { serialPortReturn = TelescopeList.LX200GPS_42G; });
+            _serialMock.Setup(x => x.Transmit("#:SB1#")).Callback(() => { serialPortReturn = "1"; });
+
+            var ggCall = 0;
+
+            _serialMock.Setup(x => x.Transmit("#:GG#")).Callback(() => {
+                ggCall++;
+                if (ggCall == 1)
+                    throw new Exception("Fake Timeout");
+                else
+                    serialPortReturn = "0"; });
+            _serialMock.Setup(x => x.ReceiveTerminated("#")).Returns(() => serialPortReturn);
+            _serialMock.Setup(x => x.ReceiveCounted(1)).Returns(() => "1");
+
+            var connectionResult = SharedResources.Connect(deviceId, string.Empty, _traceLoggerMock.Object);
+            try
+            {
+                Assert.That(SharedResources.ProductName, Is.EqualTo(TelescopeList.LX200GPS));
+                Assert.That(SharedResources.FirmwareVersion, Is.EqualTo(TelescopeList.LX200GPS_42G));
+
+                _traceLoggerMock.Verify(x => x.LogIssue("Connect", $"Telescope serial port speed change, connecting at ps{WantedSpeed}."), Times.Once);
+            }
+            finally
+            {
+                SharedResources.Disconnect(deviceId, String.Empty);
+            }
+        }
+
+        [TestCase("57600")]
+        [TestCase("38400")]
+        [TestCase("28800")]
+        [TestCase("19200")]
+        [TestCase("14400")]
+        [TestCase("4800")]
+        [TestCase("2400")]
+        [TestCase("1200")]
+        public void Connect_WhenAutostarReportsFailedToChangeSpeec_ThenConnectsAutoStarAtDefaultSpeed(string WantedSpeed)
+        {
+            string deviceId = "Serial";
+
+            string DriverId = "ASCOM.MeadeGeneric.Telescope";
+
+            string TraceStateDefault = "false";
+
+            string ComPortDefault = "COM1";
+            string SpeedDefault = "9600";
+            string DataBitsDefault = "8";
+            string StopBitsDefault = "One";
+            string HandshakeDefault = "None";
+            string ParityDefault = "None";
+            string RtsDtrEnabledDefault = "false";
+
+            string GuideRateProfileNameDefault = "10.077939"; //67% of sidereal rate
+            string PrecisionDefault = "Unchanged";
+
+            string ParkedBehaviourDefault = "No Coordinates";
+            string ParkedAltDefault = "0";
+            string ParkedAzimuthDefault = "180";
+            string FocalLengthDefault = "2000";
+            string ApertureAreaDefault = "32685";
+            string ApertureDiameterDefault = "203";
+
+            Mock<IProfileWrapper> profileWrapperMock = new Mock<IProfileWrapper>();
+            profileWrapperMock.SetupAllProperties();
+
+            profileWrapperMock.Setup(x => x.GetValue(DriverId, "Trace Level", string.Empty, TraceStateDefault))
+                .Returns(TraceStateDefault);
+            profileWrapperMock.Setup(x => x.GetValue(DriverId, "COM Port", string.Empty, ComPortDefault))
+                .Returns(ComPortDefault);
+            profileWrapperMock
+                .Setup(x => x.GetValue(DriverId, "Guide Rate Arc Seconds Per Second", string.Empty,
+                    GuideRateProfileNameDefault)).Returns(GuideRateProfileNameDefault);
+            profileWrapperMock.Setup(x => x.GetValue(DriverId, "Precision", string.Empty, PrecisionDefault))
+                .Returns(PrecisionDefault);
+            profileWrapperMock.Setup(x =>
+               x.GetValue(DriverId, "Speed", string.Empty, SpeedDefault))
+                   .Returns(() => WantedSpeed);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Data Bits", string.Empty, DataBitsDefault))
+                .Returns(() => DataBitsDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Stop Bits", string.Empty, StopBitsDefault))
+                .Returns(() => StopBitsDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Hand Shake", string.Empty, HandshakeDefault))
+                .Returns(() => HandshakeDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Parity", string.Empty, ParityDefault))
+                .Returns(() => ParityDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Rts / Dtr", string.Empty, RtsDtrEnabledDefault))
+                .Returns(() => RtsDtrEnabledDefault);
+
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Parked Behaviour", string.Empty, ParkedBehaviourDefault))
+                .Returns(() => ParityDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Parked Altitude", string.Empty, ParkedAltDefault))
+                .Returns(() => ParkedAltDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Parked Azimuth", string.Empty, ParkedAzimuthDefault))
+                .Returns(() => ParkedAzimuthDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Focal Length (mm)", string.Empty, FocalLengthDefault))
+                .Returns(() => FocalLengthDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Aperture Area (mm²)", string.Empty, ApertureAreaDefault))
+                .Returns(() => ApertureAreaDefault);
+            profileWrapperMock.Setup(x =>
+                    x.GetValue(DriverId, "Aperture Diameter (mm)", string.Empty, ApertureDiameterDefault))
+                .Returns(() => ApertureDiameterDefault);
+
+            Mock<IProfileFactory> profileFactoryMock = new Mock<IProfileFactory>();
+            profileFactoryMock.Setup(x => x.Create()).Returns(profileWrapperMock.Object);
+
+            SharedResources.ProfileFactory = profileFactoryMock.Object;
+
+            string serialPortReturn = string.Empty;
+
+            _serialMock.Setup(x => x.Transmit("#:GVP#")).Callback(() => { serialPortReturn = TelescopeList.LX200GPS; });
+            _serialMock.Setup(x => x.Transmit("#:GVN#")).Callback(() => { serialPortReturn = TelescopeList.LX200GPS_42G; });
+            _serialMock.Setup(x => x.Transmit("#:SB1#")).Callback(() => { serialPortReturn = "1"; });
+
+            var ggCall = 0;
+
+            _serialMock.Setup(x => x.Transmit("#:GG#")).Callback(() => {
+                ggCall++;
+                if (ggCall == 1)
+                    throw new Exception("Fake Timeout");
+                else
+                    serialPortReturn = "0";
+            });
+            _serialMock.Setup(x => x.ReceiveTerminated("#")).Returns(() => serialPortReturn);
+            _serialMock.Setup(x => x.ReceiveCounted(1)).Returns(() => "0");
+
+            var connectionResult = SharedResources.Connect(deviceId, string.Empty, _traceLoggerMock.Object);
+            try
+            {
+                Assert.That(SharedResources.ProductName, Is.EqualTo(TelescopeList.LX200GPS));
+                Assert.That(SharedResources.FirmwareVersion, Is.EqualTo(TelescopeList.LX200GPS_42G));
+
+                _traceLoggerMock.Verify(x => x.LogIssue("Connect", $"Telescope not responding to speed change, connecting at ps{SpeedDefault}."), Times.Once);
+            }
+            finally
+            {
+                SharedResources.Disconnect(deviceId, String.Empty);
+            }
+        }
+
         [Test]
         public void Connect_WhenSerialPortIsNotRespondingCorrectly_ThenExceptionThrown()
         {
diff --git a/Meade.net/SetupDialogForm.cs b/Meade.net/SetupDialogForm.cs
index 2529e32..e8f067d 100644
--- a/Meade.net/SetupDialogForm.cs
+++ b/Meade.net/SetupDialogForm.cs
@@ -25,7 +25,7 @@ namespace ASCOM.Meade.net
 
             SetItemsFromEnum(cboStopBits.Items, typeof(SerialStopBits));
             SetItemsFromEnum(cboParity.Items, typeof(SerialParity));
-            SetItemsFromEnumValues(cboSpeed.Items, typeof(SerialSpeed));
+            SetItemFromEnumValues(cboSpeed.Items, SerialSpeed.ps1200, SerialSpeed.ps57600);
             SetItemsFromEnum(cboHandShake.Items, typeof(SerialHandshake));
             SetItemsFromEnum(cboParkedBehaviour.Items, typeof(ParkedBehaviour));
         }
@@ -41,13 +41,30 @@ namespace ASCOM.Meade.net
             }
         }
 
-        private void SetItemsFromEnumValues(IList items, Type enumItems)
+        //private void SetItemsFromEnumValues(IList items, Type enumItems)
+        //{
+        //    items.Clear();
+
+        //    foreach (int item in Enum.GetValues(enumItems))
+        //    {
+        //        items.Add(item);
+        //    }
+        //}
+
+        private void SetItemFromEnumValues<T>(IList items, T minValue, T maxValue)
         {
             items.Clear();
 
-            foreach (int item in Enum.GetValues(enumItems))
+            var type = typeof(T);
+
+            var intMinValue = (int)Convert.ChangeType(minValue, typeof(int));
+
+            var intMaxValue = (int)Convert.ChangeType(maxValue, typeof(int));
+
+            foreach (int item in Enum.GetValues(type))
             {
-                items.Add(item);
+                if ((item >= intMinValue) && (item <= intMaxValue))
+                    items.Add(item);
             }
         }
 
diff --git a/Meade.net/SharedResources.cs b/Meade.net/SharedResources.cs
index 4ad7cf6..08942aa 100644
--- a/Meade.net/SharedResources.cs
+++ b/Meade.net/SharedResources.cs
@@ -18,7 +18,7 @@ using System;
 using System.Collections.Generic;
 using System.Globalization;
 using System.Runtime.InteropServices;
-using System.Security.AccessControl;
+using System.Text;
 using System.Threading;
 using System.Windows.Forms;
 using ASCOM.DeviceInterface;
@@ -389,8 +389,70 @@ namespace ASCOM.Meade.net
                         SharedSerial.DataBits = profileProperties.DataBits;
                         SharedSerial.StopBits = (SerialStopBits)Enum.Parse(typeof(SerialStopBits), profileProperties.StopBits);
                         SharedSerial.Parity = (SerialParity)Enum.Parse(typeof(SerialParity), profileProperties.Parity);
-                        SharedSerial.Speed = (SerialSpeed)profileProperties.Speed;
                         SharedSerial.Handshake = (SerialHandshake)Enum.Parse(typeof(SerialHandshake), profileProperties.Handshake);
+                        SharedSerial.Speed = SerialSpeed.ps9600;
+                        
+                        var wantedSpeed = (SerialSpeed)profileProperties.Speed;
+                        if (wantedSpeed != SerialSpeed.ps9600)
+                        {
+                            SharedSerial.Speed = wantedSpeed;
+                            SharedSerial.Connected = true;
+
+                            var speedRampNeeded = false;
+
+                            //Test if communication is working.
+                            try
+                            {
+                                string utcOffSet = SendString("GG");
+                            }
+                            catch (Exception)
+                            {
+                                speedRampNeeded = true;
+                            }
+
+                            if (speedRampNeeded)
+                            {
+                                SharedSerial.Connected = false;
+                                SharedSerial.Speed = SerialSpeed.ps9600;
+                                SharedSerial.Connected = true;
+
+                                int newSpeedIndex = GetSpeedIndex(wantedSpeed);
+                                //:SBn# Set Baud Rate n, where n is an ASCII digit (1..9) with the following interpertation
+                                //  1 56.7K
+                                //  2 38.4K
+                                //  3 28.8K
+                                //  4 19.2K
+                                //  5 14.4K
+                                //  6 9600
+                                //  7 4800
+                                //  8 2400
+                                //  9 1200
+                                //Returns:
+                                //  1 At the current baud rate and then changes to the new rate for further communication
+                                //SendBlind($"SB{newSpeedIndex}");
+                                try
+                                {
+                                    var speedChanged = SendChar($"SB{newSpeedIndex}");
+                                    if (speedChanged == "1")
+                                    {
+                                        SharedSerial.Connected = false;
+                                        SharedSerial.Speed = wantedSpeed;
+                                        traceLogger.LogIssue("Connect",
+                                            $"Telescope serial port speed change, connecting at {SharedSerial.Speed}.");
+                                    }
+                                    else
+                                    {
+                                        throw new Exception("Autostar not signalled speed change.");
+                                    }
+                                }
+                                catch (Exception)
+                                {
+                                    SharedSerial.Connected = false;
+                                    SharedSerial.Speed = SerialSpeed.ps9600;
+                                    traceLogger.LogIssue("Connect", $"Telescope not responding to speed change, connecting at {SharedSerial.Speed}.");
+                                }
+                            }
+                        }
                         SharedSerial.Connected = true;
 
                         try
@@ -451,6 +513,23 @@ namespace ASCOM.Meade.net
             }
         }
 
+        private static int GetSpeedIndex(SerialSpeed speed)
+        {
+            switch (speed)
+            {
+                case SerialSpeed.ps57600: return 1;
+                case SerialSpeed.ps38400: return 2;
+                case SerialSpeed.ps28800: return 3;
+                case SerialSpeed.ps19200: return 4;
+                case SerialSpeed.ps14400: return 5;
+                case SerialSpeed.ps9600: return 6;
+                case SerialSpeed.ps4800: return 7;
+                case SerialSpeed.ps2400: return 8;
+                case SerialSpeed.ps1200: return 9;
+                default: throw new NotSupportedException($"{SpeedDefault} not supported");
+            }
+        }
+
         public static void Disconnect(string deviceId, string driverId)
         {
             lock (LockObject)