diff --git a/meshtastic/mesh_interface.py b/meshtastic/mesh_interface.py
index 10633bd..3301c62 100644
--- a/meshtastic/mesh_interface.py
+++ b/meshtastic/mesh_interface.py
@@ -4,6 +4,7 @@ import sys
 import random
 import time
 import logging
+import collections
 from typing import AnyStr
 import threading
 from datetime import datetime
@@ -55,6 +56,8 @@ class MeshInterface:
         self.configId = None
         self.gotResponse = False # used in gpio read
         self.mask = None # used in gpio read and gpio watch
+        self.queueStatus = None
+        self.queue = collections.OrderedDict()
 
     def close(self):
         """Shutdown this interface"""
@@ -505,13 +508,61 @@ class MeshInterface:
         m.disconnect = True
         self._sendToRadio(m)
 
+    def _queueHasFreeSpace(self):
+        # We never got queueStatus, maybe the firmware is old
+        if self.queueStatus is None:
+            return True
+        return self.queueStatus.free > 0
+
+    def _queueClaim(self):
+        if self.queueStatus is None:
+            return
+        self.queueStatus.free -= 1
+
     def _sendToRadio(self, toRadio):
         """Send a ToRadio protobuf to the device"""
         if self.noProto:
             logging.warning(f"Not sending packet because protocol use is disabled by noProto")
         else:
             #logging.debug(f"Sending toRadio: {stripnl(toRadio)}")
-            self._sendToRadioImpl(toRadio)
+
+            if not toRadio.HasField('packet'):
+                # not a meshpacket -- send immediately, give queue a chance,
+                # this makes heartbeat trigger queue
+                self._sendToRadioImpl(toRadio)
+            else:
+                # meshpacket -- queue
+                self.queue[toRadio.packet.id] = toRadio
+
+            resentQueue = collections.OrderedDict()
+
+            while self.queue:
+                #logging.warn("queue: " + " ".join(f'{k:08x}' for k in self.queue))
+                while not self._queueHasFreeSpace():
+                    logging.debug("Waiting for free space in TX Queue")
+                    time.sleep(0.5)
+                try:
+                    toResend = self.queue.popitem(last=False)
+                except KeyError:
+                    break
+                packetId, packet = toResend
+                #logging.warn(f"packet: {packetId:08x} {packet}")
+                resentQueue[packetId] = packet
+                if packet is False:
+                    continue
+                self._queueClaim()
+                if packet != toRadio:
+                    logging.debug(f"Resending packet ID {packetId:08x} {packet}")
+                self._sendToRadioImpl(packet)
+
+            #logging.warn("resentQueue: " + " ".join(f'{k:08x}' for k in resentQueue))
+            for packetId, packet in resentQueue.items():
+                if self.queue.pop(packetId, False) is False: # Packet got acked under us
+                    logging.debug(f"packet {packetId:08x} got acked under us")
+                    continue
+                if packet:
+                    self.queue[packetId] = packet
+            #logging.warn("queue + resentQueue: " + " ".join(f'{k:08x}' for k in self.queue))
 
     def _sendToRadioImpl(self, toRadio):
         """Send a ToRadio protobuf to the device"""
@@ -524,6 +575,21 @@ class MeshInterface:
         """
         self.localNode.requestChannels()
 
+    def _handleQueueStatusFromRadio(self, queueStatus):
+        self.queueStatus = queueStatus
+        logging.debug(f"TX QUEUE free {queueStatus.free} of {queueStatus.maxlen}, res = {queueStatus.res}, id = {queueStatus.mesh_packet_id:08x} ")
+
+        if queueStatus.res:
+            return
+
+        #logging.warn("queue: " + " ".join(f'{k:08x}' for k in self.queue))
+        justQueued = self.queue.pop(queueStatus.mesh_packet_id, None)
+
+        if justQueued is None and queueStatus.mesh_packet_id != 0:
+            self.queue[queueStatus.mesh_packet_id] = False
+            logging.debug(f"Reply for unexpected packet ID {queueStatus.mesh_packet_id:08x}")
+        #logging.warn("queue: " + " ".join(f'{k:08x}' for k in self.queue))
+
     def _handleFromRadio(self, fromRadioBytes):
         """
         Handle a packet that arrived from the radio(update model and publish events)
@@ -580,6 +646,9 @@ class MeshInterface:
         elif fromRadio.HasField("packet"):
             self._handlePacketFromRadio(fromRadio.packet)
 
+        elif fromRadio.HasField('queueStatus'):
+            self._handleQueueStatusFromRadio(fromRadio.queueStatus)
+
         elif fromRadio.rebooted:
             # Tell clients the device went away.  Careful not to call the overridden
             # subclass version that closes the serial port