Update TasmotaModbus to 1.2.0

Update TasmotaModbus to 1.2.0

lib/TasmotaModbus-1.2.0/library.json

@@ -1,6 +1,6 @@
 {
     "name": "TasmotaModbus",
-    "version": "1.1.1",
+    "version": "1.2.0",
     "keywords": [
       "serial", "io", "TasmotaModbus"
     ],

lib/TasmotaModbus-1.2.0/library.properties

@@ -1,5 +1,5 @@
 name=TasmotaModbus
-version=1.1.1
+version=1.2.0
 author=Theo Arends
 maintainer=Theo Arends <theo@arends.com>
 sentence=Basic modbus wrapper for TasmotaSerial for ESP8266.

lib/TasmotaModbus-1.2.0/src/TasmotaModbus.cpp

@@ -61,10 +61,10 @@ void TasmotaModbus::Send(uint8_t device_address, uint8_t function_code, uint16_t
 
   frame[0] = mb_address;        // 0xFE default device address or dedicated like 0x01
   frame[1] = function_code;
-  frame[2] = (uint8_t)(start_address >> 8);
-  frame[3] = (uint8_t)(start_address);
-  frame[4] = (uint8_t)(register_count >> 8);
-  frame[5] = (uint8_t)(register_count);
+  frame[2] = (uint8_t)(start_address >> 8);   // MSB
+  frame[3] = (uint8_t)(start_address);        // LSB
+  frame[4] = (uint8_t)(register_count >> 8);  // MSB
+  frame[5] = (uint8_t)(register_count);       // LSB
   uint16_t crc = CalculateCRC(frame, 6);
   frame[6] = (uint8_t)(crc);
   frame[7] = (uint8_t)(crc >> 8);
@@ -80,33 +80,46 @@ bool TasmotaModbus::ReceiveReady()
 
 uint8_t TasmotaModbus::ReceiveBuffer(uint8_t *buffer, uint8_t register_count)
 {
-  uint8_t len = 0;
+  mb_len = 0;
   uint32_t last = millis();
-  while ((available() > 0) && (len < (register_count *2) + 5) && (millis() - last < 10)) {
+  while ((available() > 0) && (mb_len < (register_count *2) + 5) && (millis() - last < 10)) {
     uint8_t data = (uint8_t)read();
-    if (!len) {                  // Skip leading data as provided by hardware serial
+    if (!mb_len) {               // Skip leading data as provided by hardware serial
       if (mb_address == data) {
-        buffer[len++] = data;
+        buffer[mb_len++] = data;
       }
     } else {
-      buffer[len++] = data;
-      if (3 == len) {
+      buffer[mb_len++] = data;
+      if (3 == mb_len) {
         if (buffer[1] & 0x80) {  // 01 84 02 f2 f1
-          return buffer[2];      // 1 = Illegal Function, 2 = Illegal Address, 3 = Illegal Data, 4 = Slave Error
+          return buffer[2];      // 1 = Illegal Function,
+                                 // 2 = Illegal Data Address,
+                                 // 3 = Illegal Data Value,
+                                 // 4 = Slave Error
+                                 // 5 = Acknowledge but not finished (no error)
+                                 // 6 = Slave Busy
+                                 // 8 = Memory Parity error
+                                 // 10 = Gateway Path Unavailable
+                                 // 11 = Gateway Target device failed to respond
         }
       }
     }
     last = millis();
   }
 
-  if (len < 7) { return 7; }               // 7 = Not enough data
-  if (len != buffer[2] + 5) {
-    buffer[2] = len - 5;                   // As it's wrong anyway let's store actual number received in here (5 will be added by client)
-    return 8;                              // 8 = Unexpected result
-  }
+  if (mb_len < 7) { return 7; }  // 7 = Not enough data
 
-  uint16_t crc = (buffer[len -1] << 8) | buffer[len -2];
-  if (CalculateCRC(buffer, len -2) != crc) { return 9; }  // 9 = crc error
+/*
+  if (mb_len != buffer[2] + 5) {
+    buffer[2] = mb_len - 5;      // As it's wrong anyway let's store actual number received in here (5 will be added by client)
+    return 3;                    // 3 = Unexpected result
+  }
+*/
+
+  uint16_t crc = (buffer[mb_len -1] << 8) | buffer[mb_len -2];
+  if (CalculateCRC(buffer, mb_len -2) != crc) {
+    return 9;                    // 9 = crc error
+  }
 
   return 0;                      // 0 = No error
 }

lib/TasmotaModbus-1.2.0/src/TasmotaModbus.h

@@ -37,21 +37,28 @@ class TasmotaModbus : public TasmotaSerial {
     bool ReceiveReady();
 
     /* Return codes:
-     * 0 - No error
-     * 1 - Illegal function
-     * 2 - Illegal address
-     * 3 - Illegal data
-     * 4 - Slave error
-     * 7 - Not enough minimal data received
-     * 8 - Not enough data receieved
-     * 9 - Crc error
+     * 0 = No error
+     * 1 = Illegal Function,
+     * 2 = Illegal Data Address,
+     * 3 = Illegal Data Value,
+     * 4 = Slave Error
+     * 5 = Acknowledge but not finished (no error)
+     * 6 = Slave Busy
+     * 7 = Not enough minimal data received
+     * 8 = Memory Parity error
+     * 9 = Crc error
+     * 10 = Gateway Path Unavailable
+     * 11 = Gateway Target device failed to respond
      */
     uint8_t ReceiveBuffer(uint8_t *buffer, uint8_t register_count);
     uint8_t Receive16BitRegister(uint16_t *value);
     uint8_t Receive32BitRegister(float *value);
 
+    uint8_t ReceiveCount(void) { return mb_len; }
+
   private:
     uint8_t mb_address;
+    uint8_t mb_len;
 };
 
 #endif  // TasmotaModbus_h