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feat(modbus): Implement persistent and improved reconfiguration for Modbus server 

This commit enhances the Modbus server's configuration handling by:

- Loading saved baudrate and unit ID settings during initialization, ensuring persistence across reboots.
- Providing improved feedback during `modbus_reconfigure`, including logging for successful changes and informing the user when a device restart is required for changes to take effect.
- Saving new configuration settings even if immediate reinitialization fails, allowing them to be applied on the next boot.
This commit is contained in:
Eduard Iten 2025-07-03 18:59:01 +02:00
parent 9f96384aa5
commit bb25134b6c
1 changed files with 28 additions and 0 deletions
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28
software/lib/modbus_server/modbus_server.c
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@ -158,6 +158,17 @@ static struct modbus_user_callbacks mbs_cbs = {
int modbus_server_init(void)
{
k_timer_init(&watchdog_timer, watchdog_timer_handler, NULL);
// Load saved settings
uint32_t saved_baudrate = 19200;
uint8_t saved_unit_id = 1;
settings_load_one("modbus/baudrate", &saved_baudrate, sizeof(saved_baudrate));
settings_load_one("modbus/unit_id", &saved_unit_id, sizeof(saved_unit_id));
// Apply loaded settings
server_param.serial.baud = saved_baudrate;
server_param.server.unit_id = saved_unit_id;
const char iface_name[] = {DEVICE_DT_NAME(MODBUS_NODE)};
#if DT_NODE_HAS_COMPAT(DT_PARENT(MODBUS_NODE), zephyr_cdc_acm_uart)
const struct device *const dev = DEVICE_DT_GET(DT_PARENT(MODBUS_NODE));
@ -182,20 +193,37 @@ int modbus_server_init(void)
return modbus_iface;
}
server_param.server.user_cb = &mbs_cbs;
LOG_INF("Starting Modbus server: baudrate=%u, unit_id=%u", saved_baudrate, saved_unit_id);
return modbus_init_server(modbus_iface, server_param);
}
int modbus_reconfigure(uint32_t baudrate, uint8_t unit_id)
{
// Update parameters
server_param.serial.baud = baudrate;
server_param.server.unit_id = unit_id;
// Try to reinitialize - this should work for most cases
int ret = modbus_init_server(modbus_iface, server_param);
if (ret == 0)
{
settings_save_one("modbus/baudrate", &baudrate, sizeof(baudrate));
settings_save_one("modbus/unit_id", &unit_id, sizeof(unit_id));
LOG_INF("Modbus reconfigured: baudrate=%u, unit_id=%u", baudrate, unit_id);
}
else
{
LOG_ERR("Failed to reconfigure Modbus: %d", ret);
LOG_INF("Modbus reconfiguration requires restart to take effect");
// Save settings for next boot
settings_save_one("modbus/baudrate", &baudrate, sizeof(baudrate));
settings_save_one("modbus/unit_id", &unit_id, sizeof(unit_id));
LOG_INF("Settings saved. Type 'reset' to restart the device and apply the change.");
return 0; // Return success since settings are saved
}
return ret;