diff --git a/esp32_fw/data/index.html b/esp32_fw/data/index.html
index 022390a9..8a65efa4 100644
--- a/esp32_fw/data/index.html
+++ b/esp32_fw/data/index.html
@@ -26,6 +26,7 @@
 	<form action="send_image" method="POST" target="empty">
         DST:<input name="dst" class="dst" size=12 maxlength=12 type="text" placeholder="001122334455">  
 		Filename:<input name="filename" type="text" placeholder="default.bmp">
+		Next check-in:<input name="ttl" type="text" placeholder="1"> min
                  <input type="submit" value="Send Image">
 </form>
 </div>
diff --git a/esp32_fw/include/commstructs.h b/esp32_fw/include/commstructs.h
index 3cac0a35..b9b6a5d6 100644
--- a/esp32_fw/include/commstructs.h
+++ b/esp32_fw/include/commstructs.h
@@ -45,15 +45,14 @@ struct AvailDataInfo {
     uint64_t dataVer;
     uint32_t dataSize;
     uint8_t dataType;
+    uint16_t nextCheckIn;
 } __packed;
 
 struct pendingData {
     struct AvailDataInfo availdatainfo;
-    uint8_t attemptsLeft;
+    uint16_t attemptsLeft;
     uint8_t targetMac[8];
 } __packed;
 
-
-
 #define BLOCK_DATA_SIZE 4096
 #define BLOCK_XFER_BUFFER_SIZE BLOCK_DATA_SIZE + sizeof(struct blockData)
\ No newline at end of file
diff --git a/esp32_fw/include/newproto.h b/esp32_fw/include/newproto.h
index 84922d25..54ffe327 100644
--- a/esp32_fw/include/newproto.h
+++ b/esp32_fw/include/newproto.h
@@ -4,7 +4,7 @@ extern void addCRC(void* p, uint8_t len);
 extern bool checkCRC(void* p, uint8_t len);
 
 extern void processBlockRequest(struct espBlockRequest* br);
-extern bool prepareDataAvail(String* filename, uint8_t dataType, uint8_t* dst);
+extern bool prepareDataAvail(String* filename, uint8_t dataType, uint8_t* dst, uint16_t nextCheckin);
 extern void processJoinNetwork(struct espJoinNetwork* xjn);
 extern void processXferComplete(struct espXferComplete* xfc);
 extern void processDataReq(struct espAvailDataReq* adr);
\ No newline at end of file
diff --git a/esp32_fw/src/newproto.cpp b/esp32_fw/src/newproto.cpp
index 1f28f6a8..44900621 100644
--- a/esp32_fw/src/newproto.cpp
+++ b/esp32_fw/src/newproto.cpp
@@ -47,7 +47,7 @@ void prepareCancelPending(uint64_t ver) {
     sendCancelPending(&pending);
 }
 
-bool prepareDataAvail(String* filename, uint8_t dataType, uint8_t* dst) {
+bool prepareDataAvail(String* filename, uint8_t dataType, uint8_t* dst, uint16_t nextCheckin) {
     *filename = "/" + *filename;
     if (!LittleFS.exists(*filename)) return false;
     File file = LittleFS.open(*filename);
@@ -72,6 +72,7 @@ bool prepareDataAvail(String* filename, uint8_t dataType, uint8_t* dst) {
     pending.availdatainfo.dataType = dataType;
     pending.availdatainfo.dataVer = *((uint64_t*)md5bytes);
     pending.availdatainfo.dataSize = file.size();
+    pending.availdatainfo.nextCheckIn = nextCheckin;
     pending.attemptsLeft = 10;
     sendDataAvail(&pending);
 
diff --git a/esp32_fw/src/web.cpp b/esp32_fw/src/web.cpp
index 7b31c934..35c5297a 100644
--- a/esp32_fw/src/web.cpp
+++ b/esp32_fw/src/web.cpp
@@ -234,9 +234,11 @@ void init_web() {
     server.on("/send_image", HTTP_POST, [](AsyncWebServerRequest *request) {
         String filename;
         String dst;
+        uint16_t nextCheckin;
         if (request->hasParam("filename", true) && request->hasParam("dst", true)) {
             filename = request->getParam("filename", true)->value();
             dst = request->getParam("dst", true)->value();
+            nextCheckin = request->getParam("ttl",true)->value().toInt();
             uint8_t mac_addr[12];  // I expected this to return like 8 values, but if I make the array 8 bytes long, things die.
             mac_addr[0] = 0x00;
             mac_addr[1] = 0x00;
@@ -250,7 +252,7 @@ void init_web() {
                 request->send(200, "text/plain", "Something went wrong trying to parse the mac address");
             } else {
                 *((uint64_t *)mac_addr) = swap64(*((uint64_t *)mac_addr));
-                if (prepareDataAvail(&filename, DATATYPE_IMGRAW, mac_addr)) {
+                if (prepareDataAvail(&filename, DATATYPE_IMGRAW, mac_addr, nextCheckin)) {
                     request->send(200, "text/plain", "Sending to " + dst);
                 } else {
                     request->send(200, "text/plain", "Couldn't find filename :(");
@@ -281,7 +283,7 @@ void init_web() {
                 request->send(200, "text/plain", "Something went wrong trying to parse the mac address");
             } else {
                 *((uint64_t *)mac_addr) = swap64(*((uint64_t *)mac_addr));
-                if (prepareDataAvail(&filename, DATATYPE_UPDATE, mac_addr)) {
+                if (prepareDataAvail(&filename, DATATYPE_UPDATE, mac_addr, 0)) {
                     request->send(200, "text/plain", "Sending FW to " + dst);
                 } else {
                     request->send(200, "text/plain", "Couldn't find filename :(");
@@ -311,7 +313,7 @@ void init_web() {
                 request->send(200, "text/plain", "Something went wrong trying to parse the mac address");
             } else {
                 *((uint64_t *)mac_addr) = swap64(*((uint64_t *)mac_addr));
-                if (prepareDataAvail(&filename, DATATYPE_NOUPDATE, mac_addr)) {
+                if (prepareDataAvail(&filename, DATATYPE_NOUPDATE, mac_addr,0)) {
                     request->send(200, "text/plain", "Sending check-in request to " + dst);
                 }
             }