diff --git a/mini-beieli-node.ino b/mini-beieli-node.ino
index 5f154cf..2827fce 100644
--- a/mini-beieli-node.ino
+++ b/mini-beieli-node.ino
@@ -147,11 +147,6 @@ bool fUsbPower;
 static osjob_t iterationJob;
 static osjob_t sendJob;
 
-// the cycle time to use
-unsigned gTxCycle;
-// remaining before we reset to default
-unsigned gTxCycleCount;
-
 void setup(void)
 {
   gCatena.begin();
@@ -251,7 +246,6 @@ void setup_platform(void)
   }
 
   gLoRaWAN.SetReceiveBufferBufferCb(receiveMessage);
-  setTxCycleTime(CATCFG_T_CYCLE_INITIAL, CATCFG_INTERVAL_COUNT_INITIAL);
   gCatena.registerObject(&gLoRaWAN);
 
   /* find the platform */
@@ -346,6 +340,9 @@ void setup_uplink(void)
 
   LMIC_setClockError(1 * 65536 / 100);
 
+  // explicitly enable LinkCheckMode
+  gLoRaWAN.SetLinkCheckMode(true);
+
   /* figure out when to reboot */
   gRebootMs = (CATCFG_T_REBOOT + os_getRndU2() - 32768) * 1000;
 
@@ -925,30 +922,6 @@ void doSleepAlert(const bool fDeepSleep)
 
 }
 
-void updateSleepCounters(void)
-{
-  // update the sleep parameters
-  if (gTxCycleCount > 1)
-  {
-    // values greater than one are decremented and ultimately reset to default.
-    --gTxCycleCount;
-  }
-  else if (gTxCycleCount == 1)
-  {
-    // it's now one (otherwise we couldn't be here.)
-    if (config_data.debug_level > 0) {
-      gCatena.SafePrintf("resetting tx cycle to default: %u\n", CATCFG_T_CYCLE);
-    }
-    gTxCycleCount = 0;
-    gTxCycle = CATCFG_T_CYCLE;
-  }
-  else
-  {
-    // it's zero. Leave it alone.
-  }
-}
-
-
 static void settleDoneCb(
   osjob_t* pSendJob)
 {
@@ -966,9 +939,6 @@ static void settleDoneCb(
 
   doSleepAlert(fDeepSleep);
 
-  /* count what we're up to */
-  updateSleepCounters();
-
   send_in_progress = false;
 }
 
@@ -1005,8 +975,6 @@ static void startNewIterationCb(osjob_t* pJob)
 
 static void receiveMessage(void *pContext, uint8_t port, const uint8_t *pMessage, size_t nMessage)
 {
-  unsigned txCycle;
-  unsigned txCount;
 
   long cal_w1_0;
   long cal_w2_0;
@@ -1122,59 +1090,8 @@ static void receiveMessage(void *pContext, uint8_t port, const uint8_t *pMessage
     }
   }
 
-  if (port == 0)
-  {
-    return;
-  }
-
-  else if (! (port == 1 && 2 <= nMessage && nMessage <= 3))
-  {
-    if (config_data.debug_level > 0) {
-      gCatena.SafePrintf("invalid message port(%02x)/length(%x)\n",
-                         port, nMessage
-                        );
-    }
-    return;
-  }
-
-  txCycle = (pMessage[0] << 8) | pMessage[1];
-
-  if (txCycle < CATCFG_T_MIN || txCycle > CATCFG_T_MAX)
-  {
-    if (config_data.debug_level > 0) {
-      gCatena.SafePrintf("tx cycle time out of range: %u\n", txCycle);
-    }
-    return;
-  }
-
-  // byte [2], if present, is the repeat count.
-  // explicitly sending zero causes it to stick.
-  txCount = CATCFG_INTERVAL_COUNT;
-  if (nMessage >= 3)
-  {
-    txCount = pMessage[2];
-  }
-
-  setTxCycleTime(txCycle, txCount);
-
 }
 
-void setTxCycleTime(unsigned txCycle, unsigned txCount)
-{
-  if (txCount > 0) {
-    if (config_data.debug_level > 0) {
-      gCatena.SafePrintf("message cycle time %u seconds for %u messages\n", txCycle, txCount);
-    }
-  }
-  else if (config_data.debug_level > 0) {
-    gCatena.SafePrintf("message cycle time %u seconds indefinitely\n", txCycle);
-  }
-
-  gTxCycle = txCycle;
-  gTxCycleCount = txCount;
-}
-
-
 /* process "application hello" -- args are ignored */
 // argv[0] is "hello"
 // argv[1..argc-1] are the (ignored) arguments
diff --git a/mini_beieli_node.h b/mini_beieli_node.h
index 73a2c83..8a40b5f 100644
--- a/mini_beieli_node.h
+++ b/mini_beieli_node.h
@@ -56,7 +56,7 @@ enum {
   |
   \****************************************************************************/
 
-static const int32_t fwVersion = 20200603;
+static const int32_t fwVersion = 20200604;
 
 static const byte INIT_PACKAGE_INTERVAL = 100;  // send an init package every 100 packages;
 static const byte MAX_VALUES_TO_SEND = 8;