From 813742332599c6139d9851fc8b519b5c630bd9de Mon Sep 17 00:00:00 2001
From: travis-farmer <travis.farmer@outlook.com>
Date: Sun, 1 Dec 2024 12:26:12 -0500
Subject: [PATCH] IO_Modbus: board support limits

---
 IO_Modbus.cpp | 5 ++++-
 IO_Modbus.h   | 6 ++++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/IO_Modbus.cpp b/IO_Modbus.cpp
index 4e9da46..0ecb098 100644
--- a/IO_Modbus.cpp
+++ b/IO_Modbus.cpp
@@ -16,7 +16,7 @@
  *  You should have received a copy of the GNU General Public License
  *  along with CommandStation.  If not, see <https://www.gnu.org/licenses/>.
  */
-
+#if defined(MBEXPERIMENTAL) || defined(ARDUINO_ARCH_STM32)
 #include "IO_Modbus.h"
 #include "defines.h"
 void ModbusADU::setTransactionId(uint16_t transactionId) {
@@ -504,6 +504,8 @@ Modbus::Modbus(uint8_t busNo, HardwareSerial &serial, unsigned long baud, uint16
   _cycleTime = cycleTimeMS * 1000UL; // convert from milliseconds to microseconds.
   _waitA = waitA;
   _waitB = waitB;
+  if (_waitA < 3) _waitA = 3;
+  if (_waitB < 2) _waitB = 2;
   // Add device to HAL device chain
   IODevice::addDevice(this);
   
@@ -643,3 +645,4 @@ Modbusnode::Modbusnode(VPIN firstVpin, int nPins, uint8_t busNo, uint8_t nodeID,
   }
   
 }
+#endif
\ No newline at end of file
diff --git a/IO_Modbus.h b/IO_Modbus.h
index 1a42c16..203929d 100644
--- a/IO_Modbus.h
+++ b/IO_Modbus.h
@@ -50,7 +50,7 @@
 
 #ifndef IO_MODBUS_H
 #define IO_MODBUS_H
-
+#if defined(MBEXPERIMENTAL) || defined(ARDUINO_ARCH_STM32)
 #include "IODevice.h"
 class ModbusADU {
   public:
@@ -406,5 +406,7 @@ public:
     return NULL;
   }
 };
-
+#else
+#error "You have included IO_Modbus on an unsupported board!"
+#endif
 #endif // IO_MODBUS_H