feat: Make valve obstacle detection parameters configurable via settings and shell

This commit introduces configurable obstacle detection thresholds for the valve, allowing them to be set and persisted via the Zephyr settings subsystem and controlled through the shell and Modbus tool.

- `software/lib/valve/Kconfig`: Added new Kconfig options `VALVE_OBSTACLE_THRESHOLD_OPEN_MA` and `VALVE_OBSTACLE_THRESHOLD_CLOSE_MA` for compile-time configuration and default values.
- `software/include/lib/valve.h`: Removed hardcoded defines and added API functions for setting and getting obstacle thresholds.
- `software/lib/valve/valve.c`:
    - Updated `valve_work_handler` to use the new configurable obstacle thresholds.
    - Integrated loading and saving of obstacle thresholds via the settings subsystem in `valve_init`.
    - Implemented the new setter and getter functions for obstacle thresholds.
    - Updated the `LOG_INF` message in `valve_init` to display the new obstacle threshold values.
- `software/apps/slave_node/prj.conf`: Added default values for the new Kconfig options.
- `software/lib/shell_valve/shell_valve.c`: Added new shell commands `valve set_obstacle_open` and `valve set_obstacle_close` to modify the obstacle thresholds, and updated `valve show` to display them.
- `software/tools/modbus_tool/modbus_tool.py`:
    - Defined new Modbus holding registers (`REG_HOLDING_OBSTACLE_THRESHOLD_OPEN_MA`, `REG_HOLDING_OBSTACLE_THRESHOLD_CLOSE_MA`).
    - Updated `poll_status` to read these new registers.
    - Modified the `main_menu` to include "Set Obstacle Open" and "Set Obstacle Close" options in the settings menu, allowing users to view and modify these parameters.
- `software/lib/modbus_server/modbus_server.c`:
    - Updated `holding_reg_rd` to read the new obstacle threshold registers.
    - Updated `holding_reg_wr` to write to the new obstacle threshold registers.
    - Removed incorrect `REG_HOLDING_END_CURRENT_THRESHOLD_OPEN_MA` and `REG_HOLDING_END_CURRENT_THRESHOLD_CLOSE_MA` cases from `input_reg_rd`.
- `software/include/lib/modbus_registers.h`: Created a new header file to centralize Modbus register definitions, which were previously hardcoded in `modbus_tool.py`.
Signed-off-by: Eduard Iten <eduard@iten.pro>

software/lib/shell_valve/shell_valve.c

@@ -55,6 +55,32 @@ static int cmd_valve_set_end_curr_close(const struct shell *sh, size_t argc, cha
 	return 0;
 }
 
+static int cmd_valve_set_obstacle_open(const struct shell *sh, size_t argc, char **argv)
+{
+	if (argc != 2) {
+		shell_print(sh, "Usage: valve set_obstacle_open <milliamps>");
+		return -EINVAL;
+	}
+
+	uint16_t current_ma = (uint16_t)atoi(argv[1]);
+	valve_set_obstacle_threshold_open(current_ma);
+	shell_print(sh, "Obstacle threshold (open) set to %u mA.", current_ma);
+	return 0;
+}
+
+static int cmd_valve_set_obstacle_close(const struct shell *sh, size_t argc, char **argv)
+{
+	if (argc != 2) {
+		shell_print(sh, "Usage: valve set_obstacle_close <milliamps>");
+		return -EINVAL;
+	}
+
+	uint16_t current_ma = (uint16_t)atoi(argv[1]);
+	valve_set_obstacle_threshold_close(current_ma);
+	shell_print(sh, "Obstacle threshold (close) set to %u mA.", current_ma);
+	return 0;
+}
+
 static int cmd_valve_show(const struct shell *sh, size_t argc, char **argv)
 {
 	const int label_width = 30;
@@ -72,6 +98,16 @@ static int cmd_valve_show(const struct shell *sh, size_t argc, char **argv)
 	    label_width,
 	    "End Current Threshold (Close):",
 	    valve_get_end_current_threshold_close());
+	shell_print(sh,
+	    "%*s %u mA",
+	    label_width,
+	    "Obstacle Threshold (Open):",
+	    valve_get_obstacle_threshold_open());
+	shell_print(sh,
+	    "%*s %u mA",
+	    label_width,
+	    "Obstacle Threshold (Close):",
+	    valve_get_obstacle_threshold_close());
 	return 0;
 }
 
@@ -86,6 +122,14 @@ SHELL_STATIC_SUBCMD_SET_CREATE(sub_valve_settings,
         NULL,
         "Set end current threshold for closing (mA)",
         cmd_valve_set_end_curr_close),
+    SHELL_CMD(set_obstacle_open,
+        NULL,
+        "Set obstacle threshold for opening (mA)",
+        cmd_valve_set_obstacle_open),
+    SHELL_CMD(set_obstacle_close,
+        NULL,
+        "Set obstacle threshold for closing (mA)",
+        cmd_valve_set_obstacle_close),
     SHELL_CMD(show, NULL, "Show valve configuration", cmd_valve_show),
     SHELL_SUBCMD_SET_END);