diff --git a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/callbacks/BleCommCallbacks.kt b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/callbacks/BleCommCallbacks.kt
index 491f26c326..5580ef31ca 100644
--- a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/callbacks/BleCommCallbacks.kt
+++ b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/callbacks/BleCommCallbacks.kt
@@ -11,6 +11,7 @@ import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.io.Chara
 import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.io.CharacteristicType.Companion.byValue
 import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.exceptions.CouldNotConfirmDescriptorWriteException
 import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.exceptions.CouldNotConfirmWriteException
+import info.nightscout.androidaps.utils.extensions.toHex
 import java.util.concurrent.BlockingQueue
 import java.util.concurrent.CountDownLatch
 import java.util.concurrent.LinkedBlockingQueue
@@ -63,10 +64,10 @@ class BleCommCallbacks(private val aapsLogger: AAPSLogger, private val incomingP
 
     private fun confirmWritePayload(expectedPayload: ByteArray, received: CharacteristicWriteConfirmationPayload) {
         if (!expectedPayload.contentEquals(received.payload)) {
-            aapsLogger.warn(LTag.PUMPBTCOMM, "Could not confirm write. Got " + received.payload + ".Excepted: " + expectedPayload)
+            aapsLogger.warn(LTag.PUMPBTCOMM, "Could not confirm write. Got " + received.payload.toHex() + ".Excepted: " + expectedPayload.toHex())
             throw CouldNotConfirmWriteException(expectedPayload, received.payload)
         }
-        aapsLogger.debug(LTag.PUMPBTCOMM, "Confirmed write with value: " + received.payload)
+        aapsLogger.debug(LTag.PUMPBTCOMM, "Confirmed write with value: " + received.payload.toHex())
     }
 
     override fun onCharacteristicWrite(gatt: BluetoothGatt, characteristic: BluetoothGattCharacteristic, status: Int) {
@@ -77,7 +78,7 @@ class BleCommCallbacks(private val aapsLogger: AAPSLogger, private val incomingP
             CharacteristicWriteConfirmationError(status)
         }
         aapsLogger.debug(LTag.PUMPBTCOMM, "OnCharacteristicWrite with status/char/value " +
-            status + "/" + byValue(characteristic.uuid.toString()) + "/" + characteristic.value)
+            status + "/" + byValue(characteristic.uuid.toString()) + "/" + characteristic.value.toHex())
         try {
             if (writeQueue.size > 0) {
                 aapsLogger.warn(LTag.PUMPBTCOMM, "Write confirm queue should be empty. found: " + writeQueue.size)
@@ -98,7 +99,7 @@ class BleCommCallbacks(private val aapsLogger: AAPSLogger, private val incomingP
         val characteristicType = byValue(characteristic.uuid.toString())
         aapsLogger.debug(LTag.PUMPBTCOMM, "OnCharacteristicChanged with char/value " +
             characteristicType + "/" +
-            payload)
+            payload.toHex())
         incomingPackets[characteristicType]!!.add(payload)
     }
 
@@ -120,7 +121,7 @@ class BleCommCallbacks(private val aapsLogger: AAPSLogger, private val incomingP
     override fun onDescriptorWrite(gatt: BluetoothGatt, descriptor: BluetoothGattDescriptor, status: Int) {
         super.onDescriptorWrite(gatt, descriptor, status)
         val writeConfirmation = if (status == BluetoothGatt.GATT_SUCCESS) {
-            aapsLogger.debug(LTag.PUMPBTCOMM, "OnDescriptor value " + descriptor.value)
+            aapsLogger.debug(LTag.PUMPBTCOMM, "OnDescriptor value " + descriptor.value.toHex())
             DescriptorWriteConfirmationUUID(descriptor.uuid.toString())
         } else {
             DescriptorWriteConfirmationError(status)
diff --git a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/io/BleIO.kt b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/io/BleIO.kt
index c1f2c89aef..a763193b77 100644
--- a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/io/BleIO.kt
+++ b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/io/BleIO.kt
@@ -7,6 +7,7 @@ import info.nightscout.androidaps.logging.AAPSLogger
 import info.nightscout.androidaps.logging.LTag
 import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.callbacks.BleCommCallbacks
 import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.exceptions.*
+import info.nightscout.androidaps.utils.extensions.toHex
 import java.util.concurrent.BlockingQueue
 import java.util.concurrent.TimeUnit
 import java.util.concurrent.TimeoutException
@@ -48,7 +49,8 @@ class BleIO(private val aapsLogger: AAPSLogger, private val chars: Map<Character
             }
             state = IOState.WRITING
         }
-        aapsLogger.debug(LTag.PUMPBTCOMM, "BleIO: Sending data on" + characteristic.name + "/" + payload.toString())
+        aapsLogger.debug(LTag.PUMPBTCOMM, "BleIO: Sending data on " + characteristic.name + "/" + payload.toHex())
+        aapsLogger.debug(LTag.PUMPBTCOMM, "BleIO: Sending data on " + characteristic.name + "/" + payload.toHex())
         val ch = chars[characteristic]
         val set = ch!!.setValue(payload)
         if (!set) {
diff --git a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/io/PayloadJoiner.kt b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/io/PayloadJoiner.kt
index a3b440d29f..de4aab89d3 100644
--- a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/io/PayloadJoiner.kt
+++ b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/io/PayloadJoiner.kt
@@ -7,7 +7,6 @@ class PayloadJoiner() {
     private val payload = ByteArrayOutputStream()
 
     fun accumulate(packet: BlePacket) {
-
     }
 
     fun bytes(): ByteArray {
diff --git a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/io/PayloadSplitter.kt b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/io/PayloadSplitter.kt
index f2eb8f3b85..4257011fa5 100644
--- a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/io/PayloadSplitter.kt
+++ b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/io/PayloadSplitter.kt
@@ -62,7 +62,7 @@ internal class PayloadSplitter(private val payload: ByteArray) {
     }
 }
 
-internal fun ByteArray.crc32(): Long {
+private fun ByteArray.crc32(): Long {
     val crc = CRC32()
     crc.update(this)
     return crc.value
diff --git a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/ltk/LTKExchanger.kt b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/ltk/LTKExchanger.kt
index 1b0d690ae5..6c2adcfb0a 100644
--- a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/ltk/LTKExchanger.kt
+++ b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/ltk/LTKExchanger.kt
@@ -12,7 +12,7 @@ internal class LTKExchanger(private val aapsLogger: AAPSLogger,private val msgIO
         val msg = PairMessage(
             destination = Address(byteArrayOf(1,2,3,4)),
             source = Address(byteArrayOf(5,6,7,8)),
-            payload = "5350313d0004024200032c5350323d000bffc32dbd20030e01000016".hexStringToByteArray(),
+            payload = "545710030100038002420000fffffffe5350313d0004024200032c5350323d000bffc32dbd20030e01000016".hexStringToByteArray(),
             sequenceNumber = 1,
         )
         msgIO.sendMesssage(msg)
diff --git a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/message/Message.kt b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/message/Message.kt
index c733cd42ef..13849815fb 100644
--- a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/message/Message.kt
+++ b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/message/Message.kt
@@ -10,12 +10,12 @@ abstract class Message(
     val ackNumber: Byte = 0.toByte(),
     val eqos: Short = 0.toShort(), // TODO: understand
     val priority: Boolean = false,
-    val lastMessage: Boolean= false,
-    val gateway: Boolean =  false,
+    val lastMessage: Boolean = false,
+    val gateway: Boolean = false,
     val sas: Boolean = false, // TODO: understand
     val tfs: Boolean = false, // TODO: understand
     val version: Short = 0.toShort(),
-    ) {
+) {
 
     fun asByteArray(): ByteArray {
         return payload; // TODO implement
diff --git a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/message/MessageIO.kt b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/message/MessageIO.kt
index 185f3d4a7b..de7b12a92b 100644
--- a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/message/MessageIO.kt
+++ b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/message/MessageIO.kt
@@ -2,19 +2,19 @@ package info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.message
 
 import info.nightscout.androidaps.logging.AAPSLogger
 import info.nightscout.androidaps.logging.LTag
-import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.BleManager
 import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.command.BleCommand
 import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.command.BleCommandCTS
-import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.command.BleCommandHello
 import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.command.BleCommandRTS
 import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.exceptions.UnexpectedCommandException
 import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.io.BleIO
 import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.io.CharacteristicType
 import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.io.PayloadSplitter
+import info.nightscout.androidaps.utils.extensions.toHex
 
 class MessageIO(private val aapsLogger: AAPSLogger, private val bleIO: BleIO) {
+
     fun sendMesssage(msg: Message) {
-        bleIO.flushIncomingQueues();
+        bleIO.flushIncomingQueues()
         bleIO.sendAndConfirmPacket(CharacteristicType.CMD, BleCommandRTS().data)
         val expectCTS = bleIO.receivePacket(CharacteristicType.CMD)
         if (BleCommand(expectCTS) != BleCommandCTS()) {
@@ -24,6 +24,7 @@ class MessageIO(private val aapsLogger: AAPSLogger, private val bleIO: BleIO) {
         val splitter = PayloadSplitter(payload)
         val packets = splitter.splitInPackets()
         for (packet in packets) {
+            aapsLogger.debug(LTag.PUMPBTCOMM, "Sending DATA: ", packet.asByteArray().toHex())
             bleIO.sendAndConfirmPacket(CharacteristicType.DATA, packet.asByteArray())
         }
         // TODO: peek for NACKs
@@ -32,10 +33,9 @@ class MessageIO(private val aapsLogger: AAPSLogger, private val bleIO: BleIO) {
             throw UnexpectedCommandException(BleCommand(expectSuccess))
         }
         // TODO: handle NACKS/FAILS/etc
-        bleIO.flushIncomingQueues();
+        bleIO.flushIncomingQueues()
     }
 
-
     fun receiveMessage(): Message? {
         // do the RTS/CTS/data/success dance
         return null
diff --git a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/packet/BlePacket.kt b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/packet/BlePacket.kt
index 525ca45d88..c19fdfe52d 100644
--- a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/packet/BlePacket.kt
+++ b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/driver/comm/packet/BlePacket.kt
@@ -1,34 +1,64 @@
 package info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.packet
 
+import java.nio.ByteBuffer
+
 sealed class BlePacket {
 
     abstract fun asByteArray(): ByteArray
+
+    companion object {
+
+        const val MAX_BLE_PACKET_LEN = 30 // we use this as the size allocated for the ByteBuffer
+    }
 }
 
-data class FirstBlePacket(val totalFragments: Byte, val payload: ByteArray, val size: Byte = 0, val crc32: Long? = null) : BlePacket() {
+data class FirstBlePacket(val totalFragments: Byte, val payload: ByteArray, val size: Byte? = null, val crc32: Long? = null) : BlePacket() {
 
     override fun asByteArray(): ByteArray {
-        TODO("Not yet implemented")
+        val bb = ByteBuffer
+            .allocate(MAX_BLE_PACKET_LEN)
+            .put(0) // index
+            .put(totalFragments) // # of fragments except FirstBlePacket and LastOptionalPlusOneBlePacket
+        crc32?.let {
+            bb.putInt(crc32.toInt())
+        }
+        size?.let {
+            bb.put(size)
+        }
+        bb.put(payload)
+        val ret = ByteArray(bb.position())
+        bb.flip()
+        bb.get(ret)
+        return ret
     }
 }
 
 data class MiddleBlePacket(val index: Byte, val payload: ByteArray) : BlePacket() {
 
     override fun asByteArray(): ByteArray {
-        TODO("Not yet implemented")
+        return byteArrayOf(index) + payload
     }
 }
 
 data class LastBlePacket(val index: Byte, val size: Byte, val payload: ByteArray, val crc32: Long) : BlePacket() {
 
     override fun asByteArray(): ByteArray {
-        TODO("Not yet implemented")
+        val bb = ByteBuffer
+            .allocate(MAX_BLE_PACKET_LEN)
+            .put(index)
+            .put(size)
+            .putInt(crc32.toInt())
+            .put(payload)
+        val ret = ByteArray(bb.position())
+        bb.flip()
+        bb.get(ret)
+        return ret
     }
 }
 
 data class LastOptionalPlusOneBlePacket(val index: Byte, val payload: ByteArray) : BlePacket() {
 
     override fun asByteArray(): ByteArray {
-        TODO("Not yet implemented")
+        return byteArrayOf(index) + payload
     }
 }
diff --git a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/ui/wizard/activation/viewmodel/action/DashInitializePodViewModel.kt b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/ui/wizard/activation/viewmodel/action/DashInitializePodViewModel.kt
index 396d56d009..692a75df06 100644
--- a/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/ui/wizard/activation/viewmodel/action/DashInitializePodViewModel.kt
+++ b/omnipod-dash/src/main/java/info/nightscout/androidaps/plugins/pump/omnipod/dash/ui/wizard/activation/viewmodel/action/DashInitializePodViewModel.kt
@@ -9,6 +9,7 @@ import info.nightscout.androidaps.logging.LTag
 import info.nightscout.androidaps.plugins.pump.omnipod.common.ui.wizard.activation.viewmodel.action.InitializePodViewModel
 import info.nightscout.androidaps.plugins.pump.omnipod.dash.R
 import info.nightscout.androidaps.plugins.pump.omnipod.dash.driver.comm.OmnipodDashBleManager
+import org.apache.commons.lang3.exception.ExceptionUtils
 import javax.inject.Inject
 
 class DashInitializePodViewModel @Inject constructor(private val aapsLogger: AAPSLogger,
@@ -27,7 +28,8 @@ class DashInitializePodViewModel @Inject constructor(private val aapsLogger: AAP
             try {
                 bleManager.activateNewPod()
             } catch (e: Exception) {
-                aapsLogger.error(LTag.PUMP, "TEST ACTIVATE Exception" + e.toString())
+                aapsLogger.error(LTag.PUMP, "TEST ACTIVATE Exception" + e.toString() + ExceptionUtils.getStackTrace(e))
+
             }
         }
 
@@ -39,4 +41,4 @@ class DashInitializePodViewModel @Inject constructor(private val aapsLogger: AAP
 
     @StringRes
     override fun getTextId() = R.string.omnipod_dash_pod_activation_wizard_initialize_pod_text
-}
\ No newline at end of file
+}