First working prototype

.gitignore

@@ -30,3 +30,9 @@
 *.exe
 *.out
 *.app
+
+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ]
+}

README.md

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 # EastronMITM
 Eastron SDM630 Modbus (Man) In The Middle
+
+## Origin
+I have a small Solar Power Plant constructed from InfiniSolar 10 kW Hybrid Inverter, Hoepecke battery and Axitec solar panels.
+Inverter uses Eastron SDM630 Modbus electricity power meter to measure feed-in to the grid and balance phases.
+This is done via RS485 Modbus RTU protocol (InfiniSolar as Modbus Master, Eastron as Modbus slave). SDM630 measures various interesting values,
+but these cannot be access since Modbus is single-master multi-slave only.
+This prototype acts as a "man-in-the-middle":
+ - reads all registers from Eastron SDM630 meter and stores them in local registers
+ - these are then accessible to both InfiniSolar via separate Modbus RTU serial interface
+   and Modbus TCP clients

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:nodemcu-32s]
+platform = espressif32
+board = nodemcu-32s
+framework = arduino
+lib_deps = emelianov/[email protected]
+monitor_speed = 115200

src/main.cpp

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+#include <Arduino.h>
+#include <HardwareSerial.h>
+#include <ModbusIP_ESP8266.h>
+#include <ModbusRTU.h>
+#include <WiFi.h>
+
+// https://support.innon.com/PowerMeters/SDM630-MOD-MID/Manual/SDM630-Modbus_Protocol.pdf
+#define EASTRON_SLAVE_ID 2
+#define INFINISOLAR_SLAVE_ID 2
+#define EASTRON_NUM_REGS 382
+
+#define WIFI_SSID "smarthome2_IoT"
+#define WIFI_PASSWORD "strongpassword"
+#define WIFI_TIMEOUT_MS 10000
+
+IPAddress esp_ip(192, 168, 2, 49);
+IPAddress esp_mask(255, 255, 255, 0);
+IPAddress esp_gw(192, 168, 2, 1);
+IPAddress esp_dns1(192, 168, 2, 2);
+
+HardwareSerial EastronSerial(1);
+HardwareSerial InfiniSolarSerial(2);
+
+ModbusRTU EastronModbus;
+ModbusRTU InfinisolarModbus;
+ModbusIP EspModbus;
+
+BaseType_t xWiFiReturned;
+TaskHandle_t xWifiTaskHandle = NULL;
+
+bool cb(Modbus::ResultCode event, uint16_t transactionId, void* data) {
+  if (event != Modbus::EX_SUCCESS) {
+    Serial.printf_P("Request result: 0x%02X, Mem: %d\n", event, ESP.getFreeHeap());
+  }
+  return true;
+}
+
+bool cbSomebodyConnected(IPAddress ip) {
+  Serial.print("New TCP client connected: ");
+  Serial.println(ip);
+  return true;
+}
+
+void keepWifiTask(void *pvParameters) {
+  for(;;) {
+    if (WiFi.status() == WL_CONNECTED) {
+      vTaskDelay(10000 / portTICK_PERIOD_MS);
+      continue;
+    }
+
+    WiFi.config(esp_ip, esp_gw, esp_mask, esp_dns1);
+
+    Serial.print("Attempting to connect to SSID: ");
+    Serial.println(WIFI_SSID);
+
+    WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
+
+    unsigned long startAttemptTime = millis();
+
+    while (WiFi.status() != WL_CONNECTED && millis() - startAttemptTime < WIFI_TIMEOUT_MS) {}
+
+    if (WiFi.status() != WL_CONNECTED) {
+      Serial.println("Wi-Fi connection failed");
+      vTaskDelay(20000 / portTICK_PERIOD_MS);
+      continue;
+    }
+
+    Serial.println("WiFi connected");  
+    Serial.print("IP address: ");
+    Serial.println(WiFi.localIP());
+
+    if (eTaskGetState(xWifiTaskHandle) == eSuspended) {
+      vTaskResume(xWifiTaskHandle);
+    }
+  }
+}
+
+void eastronTask(void *pvParameters) {
+  // Modbus RTU to power meter
+  EastronSerial.begin(19200, SERIAL_8N1, 22, 23);
+  EastronModbus.begin(&EastronSerial);
+  EastronModbus.master();
+
+  for(;;) {
+    if (!EastronModbus.slave()) {
+      EastronModbus.pullIreg(EASTRON_SLAVE_ID, 0, 0, 80, cb);
+      while(EastronModbus.slave()) {
+        EastronModbus.task();
+        delay(10);
+      }
+
+      EastronModbus.pullIreg(EASTRON_SLAVE_ID, 80, 80, 26, cb);
+      while(EastronModbus.slave()) {
+        EastronModbus.task();
+        delay(10);
+      }
+
+      EastronModbus.pullIreg(EASTRON_SLAVE_ID, 200, 200, 8, cb);
+      while(EastronModbus.slave()) {
+        EastronModbus.task();
+        delay(10);
+      }
+
+      EastronModbus.pullIreg(EASTRON_SLAVE_ID, 224, 224, 46, cb);
+      while(EastronModbus.slave()) {
+        EastronModbus.task();
+        delay(10);
+      }
+
+      EastronModbus.pullIreg(EASTRON_SLAVE_ID, 334, 334, 48, cb);
+      while(EastronModbus.slave()) {
+        EastronModbus.task();
+        delay(10);
+      }
+    }
+    vTaskDelay(1000 / portTICK_PERIOD_MS);
+  }
+}
+
+void infiniTask(void *pvParameters) {
+  // Modbus RTU to inverter
+  InfiniSolarSerial.begin(19200, SERIAL_8N1, 18, 19);
+  InfinisolarModbus.begin(&InfiniSolarSerial);
+  InfinisolarModbus.slave(INFINISOLAR_SLAVE_ID);
+  InfinisolarModbus.addIreg(0, 0, EASTRON_NUM_REGS);
+
+  for(;;) {
+    InfinisolarModbus.task();
+    delay(10);
+  }
+}
+
+void espTask(void *pvParameters) {
+  // Modbus IP for HA
+  EspModbus.onConnect(cbSomebodyConnected);
+  EspModbus.server();
+  EspModbus.addIreg(0, 0, EASTRON_NUM_REGS);
+
+  for(;;) {
+    EspModbus.task();
+    delay(10);
+  }
+}
+
+void setup() {
+  // serial console
+  Serial.begin(115200);
+
+  xTaskCreatePinnedToCore(
+    keepWifiTask,
+    "WifiTask",
+    5000,
+    NULL,
+    1,
+    NULL,
+    CONFIG_ARDUINO_RUNNING_CORE
+  );
+
+  xTaskCreate(
+    infiniTask,
+    "InfiniSolar",
+    1000,
+    NULL,
+    1,
+    NULL
+  );
+
+  xTaskCreatePinnedToCore(
+    eastronTask,
+    "Eastron",
+    1000,
+    NULL,
+    2,
+    NULL,
+    CONFIG_ARDUINO_RUNNING_CORE
+  );
+
+  xWiFiReturned = xTaskCreate(
+    espTask,
+    "ModbusTCP",
+    5000,
+    NULL,
+    1,
+    &xWifiTaskHandle
+  );
+
+  if (xWiFiReturned == pdPASS) {
+    vTaskSuspend(xWifiTaskHandle);
+  }
+}
+
+void loop() {}

test/README

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+
+This directory is intended for PlatformIO Unit Testing and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html