diff --git a/index.html b/index.html
index f1d11ac..402cbe0 100644
--- a/index.html
+++ b/index.html
@@ -30,16 +30,19 @@
                 Disconnect
             </button>
             <button @click="sendCommandAppStart" class="border border-gray-500 px-2 bg-gray-100 hover:bg-gray-200 rounded">
-                Send AppStart
+                AppStart
             </button>
             <button @click="sendSendSelfAdvert(0)" class="border border-gray-500 px-2 bg-gray-100 hover:bg-gray-200 rounded">
-                Send Advert (Zero Hop)
+                SendSelfAdvert(ZeroHop)
             </button>
             <button @click="sendSendSelfAdvert(1)" class="border border-gray-500 px-2 bg-gray-100 hover:bg-gray-200 rounded">
-                Send Advert (Flood)
+                SendSelfAdvert(Flood)
             </button>
             <button @click="sendCommandSetAdvertName" class="border border-gray-500 px-2 bg-gray-100 hover:bg-gray-200 rounded">
-                Set Advert Name
+                SetAdvertName
+            </button>
+            <button @click="sendCommandAddUpdateContact" class="border border-gray-500 px-2 bg-gray-100 hover:bg-gray-200 rounded">
+                AddUpdateContact
             </button>
             <button @click="sendCommandSyncNextMessage" class="border border-gray-500 px-2 bg-gray-100 hover:bg-gray-200 rounded">
                 SyncNextMessage
@@ -53,6 +56,15 @@
             <button @click="sendCommandSetDeviceTime" class="border border-gray-500 px-2 bg-gray-100 hover:bg-gray-200 rounded">
                 SetDeviceTime
             </button>
+            <button @click="sendCommandSetRadioParams" class="border border-gray-500 px-2 bg-gray-100 hover:bg-gray-200 rounded">
+                SetRadioParams
+            </button>
+            <button @click="sendCommandSetTxPower" class="border border-gray-500 px-2 bg-gray-100 hover:bg-gray-200 rounded">
+                SetTxPower
+            </button>
+            <button @click="sendCommandSendTxtMsg" class="border border-gray-500 px-2 bg-gray-100 hover:bg-gray-200 rounded">
+                SendTxtMsg
+            </button>
         </div>
 
     </div>
@@ -61,6 +73,7 @@
 
 <script type="module">
     import Device from "./src/device.js";
+    import Constants from "./src/constants.js";
     Vue.createApp({
         data() {
             return {
@@ -95,6 +108,14 @@
             async sendCommandAppStart() {
                 await this.device.sendCommandAppStart();
             },
+            async sendCommandSendTxtMsg() {
+                const txtType = Constants.TxtTypes.Plain;
+                const attempt = 0;
+                const senderTimestamp = Math.floor(Date.now() / 1000);
+                const pubKeyPrefix = new Uint8Array([148, 63, 175, 162, 88, 212, 192, 40, 214, 185, 213, 140, 42, 145, 194, 186, 70, 71, 112, 68, 0, 192, 65, 4, 105, 143, 230, 50, 162, 79, 247, 192]);
+                const text = `Test Message: ${senderTimestamp}`;
+                await this.device.sendCommandSendTxtMsg(txtType, attempt, senderTimestamp, pubKeyPrefix, text);
+            },
             async sendSendSelfAdvert(type) {
                 await this.device.sendCommandSendSelfAdvert(type);
             },
@@ -108,6 +129,17 @@
                 const timestamp = Math.floor(Date.now() / 1000);
                 await this.device.sendCommandSetDeviceTime(timestamp);
             },
+            async sendCommandSetTxPower() {
+                const txPower = 22;
+                await this.device.sendCommandSetTxPower(txPower);
+            },
+            async sendCommandSetRadioParams() {
+                const radioFreq = 917375;
+                const radioBw = 250000;
+                const radioSf = 7;
+                const radioCr = 5;
+                await this.device.sendCommandSetRadioParams(radioFreq, radioBw, radioSf, radioCr);
+            },
             async sendCommandSetAdvertName() {
 
                 // ask user for name
@@ -120,6 +152,18 @@
                 await this.device.sendCommandSetAdvertName(name);
 
             },
+            async sendCommandAddUpdateContact() {
+                const publicKey = new Uint8Array([148, 63, 175, 162, 88, 212, 192, 40, 214, 185, 213, 140, 42, 145, 194, 186, 70, 71, 112, 68, 0, 192, 65, 4, 105, 143, 230, 50, 162, 79, 247, 192]);
+                const type = Constants.AdvType.Chat;
+                const flags = 0;
+                const outPathLen = 0;
+                const outPath = new Uint8Array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);
+                const advName = "Boaty";
+                const lastAdvert = 1739244825;
+                const advLat = 0;
+                const advLon = 0;
+                await this.device.sendCommandAddUpdateContact(publicKey, type, flags, outPathLen, outPath, advName, lastAdvert, advLat, advLon);
+            },
             async sendCommandSyncNextMessage() {
                 await this.device.sendCommandSyncNextMessage();
             },
diff --git a/src/buffer_writer.js b/src/buffer_writer.js
index bbef00b..a8874d1 100644
--- a/src/buffer_writer.js
+++ b/src/buffer_writer.js
@@ -39,6 +39,27 @@ class BufferWriter {
         this.writeBytes(new TextEncoder().encode(string));
     }
 
+    writeCString(string, maxLength) {
+
+        // create buffer of max length
+        const bytes = new Uint8Array(new ArrayBuffer(maxLength));
+
+        // encode string to bytes
+        const encodedString = new TextEncoder().encode(string);
+
+        // copy in string until we hit the max length, or we run out of string bytes
+        for(var i = 0; i < maxLength && i < encodedString.length; i++){
+            bytes[i] = encodedString[i];
+        }
+
+        // ensure the last byte is always a null terminator
+        bytes[bytes.length - 1] = 0;
+
+        // write to buffer
+        this.writeBytes(bytes);
+
+    }
+
 }
 
 export default BufferWriter;
diff --git a/src/constants.js b/src/constants.js
index b2b6c07..73eacc8 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -7,17 +7,17 @@ class Constants {
 
     static CommandCodes = {
         AppStart: 1, // done
-        SendTxtMsg: 2,
+        SendTxtMsg: 2, // done
         SendChannelTxtMsg: 3,
         GetContacts: 4, // done
         GetDeviceTime: 5, // done
         SetDeviceTime: 6, // done
         SendSelfAdvert: 7, // done
         SetAdvertName: 8, // done
-        AddUpdateContact: 9,
+        AddUpdateContact: 9, // done
         SyncNextMessage: 10, // done
-        SetRadioParams: 11,
-        SetTxPower: 12,
+        SetRadioParams: 11, // done
+        SetTxPower: 12, // done
     }
 
     static ResponseCodes = {
@@ -27,18 +27,25 @@ class Constants {
         Contact: 3, // done
         EndOfContacts: 4, // done
         SelfInfo: 5, // done
-        Sent: 6,
+        Sent: 6, // done
         ContactMsgRecv: 7, // done
         ChannelMsgRecv: 8,
         CurrTime: 9, // done
-        NoMoreMessages: 10,
+        NoMoreMessages: 10, // done
     }
 
     static PushCodes = {
-        Advert: 0x80,
+        Advert: 0x80, // done
         PathUpdated: 0x81,
-        SendConfirmed: 0x82,
-        MsgWaiting: 0x83,
+        SendConfirmed: 0x82, // done
+        MsgWaiting: 0x83, // done
+    }
+
+    static AdvType = {
+        None: 0,
+        Chat: 1,
+        Repeater: 2,
+        Room: 3,
     }
 
     static SelfAdvertTypes = {
@@ -46,6 +53,12 @@ class Constants {
         Flood: 1,
     }
 
+    static TxtTypes = {
+        Plain: 0,
+        CliData: 1,
+        SignedPlain: 2,
+    }
+
 }
 
 export default Constants;
diff --git a/src/device.js b/src/device.js
index 8b1ee65..a9c8329 100644
--- a/src/device.js
+++ b/src/device.js
@@ -81,6 +81,17 @@ class Device {
         await this.sendToRadioFrame(data.toBytes());
     }
 
+    async sendCommandSendTxtMsg(txtType, attempt, senderTimestamp, pubKeyPrefix, text) {
+        const data = new BufferWriter();
+        data.writeByte(Constants.CommandCodes.SendTxtMsg);
+        data.writeByte(txtType);
+        data.writeByte(attempt);
+        data.writeUInt32LE(senderTimestamp);
+        data.writeBytes(pubKeyPrefix.slice(0, 6)); // only the first 6 bytes of pubKey are sent
+        data.writeString(text);
+        await this.sendToRadioFrame(data.toBytes());
+    }
+
     async sendCommandGetContacts(since) {
         const data = new BufferWriter();
         data.writeByte(Constants.CommandCodes.GetContacts);
@@ -117,12 +128,44 @@ class Device {
         await this.sendToRadioFrame(data.toBytes());
     }
 
+    async sendCommandAddUpdateContact(publicKey, type, flags, outPathLen, outPath, advName, lastAdvert, advLat, advLon) {
+        const data = new BufferWriter();
+        data.writeByte(Constants.CommandCodes.AddUpdateContact);
+        data.writeBytes(publicKey);
+        data.writeByte(type);
+        data.writeByte(flags);
+        data.writeByte(outPathLen);
+        data.writeBytes(outPath); // 64 bytes
+        data.writeCString(advName, 32); // 32 bytes
+        data.writeUInt32LE(lastAdvert);
+        data.writeUInt32LE(advLat);
+        data.writeUInt32LE(advLon);
+        await this.sendToRadioFrame(data.toBytes());
+    }
+
     async sendCommandSyncNextMessage() {
         const data = new BufferWriter();
         data.writeByte(Constants.CommandCodes.SyncNextMessage);
         await this.sendToRadioFrame(data.toBytes());
     }
 
+    async sendCommandSetRadioParams(radioFreq, radioBw, radioSf, radioCr) {
+        const data = new BufferWriter();
+        data.writeByte(Constants.CommandCodes.SetRadioParams);
+        data.writeUInt32LE(radioFreq);
+        data.writeUInt32LE(radioBw);
+        data.writeByte(radioSf);
+        data.writeByte(radioCr);
+        await this.sendToRadioFrame(data.toBytes());
+    }
+
+    async sendCommandSetTxPower(txPower) {
+        const data = new BufferWriter();
+        data.writeByte(Constants.CommandCodes.SetTxPower);
+        data.writeByte(txPower);
+        await this.sendToRadioFrame(data.toBytes());
+    }
+
     async readLoop() {
         try {
             while(true){
@@ -209,6 +252,8 @@ class Device {
             this.onSelfInfoResponse(bufferReader);
         } else if(responseCode === Constants.ResponseCodes.CurrTime){
             this.onCurrTimeResponse(bufferReader);
+        } else if(responseCode === Constants.ResponseCodes.NoMoreMessages){
+            this.onNoMoreMessagesResponse(bufferReader);
         } else if(responseCode === Constants.ResponseCodes.ContactMsgRecv){
             this.onContactMsgRecvResponse(bufferReader);
         } else if(responseCode === Constants.ResponseCodes.ContactsStart){
@@ -217,8 +262,12 @@ class Device {
             this.onContactResponse(bufferReader);
         } else if(responseCode === Constants.ResponseCodes.EndOfContacts){
             this.onEndOfContactsResponse(bufferReader);
+        } else if(responseCode === Constants.ResponseCodes.Sent){
+            this.onSentResponse(bufferReader);
         } else if(responseCode === Constants.PushCodes.Advert){
             this.onAdvertPush(bufferReader);
+        } else if(responseCode === Constants.PushCodes.SendConfirmed){
+            this.onSendConfirmedPush(bufferReader);
         } else if(responseCode === Constants.PushCodes.MsgWaiting){
             this.onMsgWaitingPush(bufferReader);
         } else {
@@ -233,6 +282,13 @@ class Device {
         });
     }
 
+    onSendConfirmedPush(bufferReader) {
+        console.log("onSendConfirmedPush", {
+            ackCode: bufferReader.readBytes(4),
+            roundTrip: bufferReader.readUInt32LE(),
+        });
+    }
+
     onMsgWaitingPush(bufferReader) {
         console.log("onMsgWaitingPush", {
 
@@ -266,6 +322,12 @@ class Device {
         });
     }
 
+    onSentResponse(bufferReader) {
+        console.log("onSentResponse", {
+
+        });
+    }
+
     onSelfInfoResponse(bufferReader) {
         console.log("onSelfInfoResponse", {
             type: bufferReader.readByte(),
@@ -287,6 +349,12 @@ class Device {
         });
     }
 
+    onNoMoreMessagesResponse(bufferReader) {
+        console.log("onNoMoreMessagesResponse", {
+
+        });
+    }
+
     onContactMsgRecvResponse(bufferReader) {
         console.log("onContactMsgRecvResponse", {
             pubKeyPrefix: bufferReader.readBytes(6),