include customization to specify the modbus TCP id ports related with suport multiple inverters. #12

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1. mcamposv commented on Nov 2, 2026

   

   mcamposv

   on Nov 2, 2026

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   Implemented in #13 (firmware 6.1-0).

   What was done

   The hard-coded MODBUS_FIXED_ID / MODBUS_TEST_REG constants are gone. There is now a Test Target subsection inside Modbus TCP target, available both in the web settings page (/config) and in the initial Setup portal:

   • Device type drop-down with presets: EMMA, SUN2000 and Custom.
   • Connection check on boot: enable / disable. When disabled, the proxy opens the gateway as soon as the ping to the target IP succeeds (the ping step always stays).
   • The 4 fields of the test request:

   Field	EMMA	SUN2000	Custom
   Unit ID	0 (editable)	1 (editable)	free
   Function code	03	03	free (1–127)
   Start register	30000	30000	free
   Register count	15	15	free

   • Selecting Custom shows a warning: the values are the user's responsibility.

   How the check works

   1. Ping to the target IP (retry every 30 s until it answers).
   2. If enabled, the Modbus test request above is sent (retry every 10 s). It passes with any valid Modbus answer — the normal reply of that function, or its exception (FC | 0x80), which proves the device's Modbus stack is alive. No specific string is expected. With FC03/FC04 the text read is shown as the device model on the OLED and the dashboard.

   Until both steps pass, incoming client connections are refused.

   The configured Unit ID only affects the startup check and the menu diagnostics. Client requests are forwarded untouched with their own Unit ID, so a client can still talk to several devices (EMMA, inverters…) through the proxy.

   Persistence

   Settings are stored in NVS and survive reboots and USB/OTA flashing. When upgrading from 6.0-0 they don't exist yet and are initialised with the EMMA values (0 / FC03 / 30000 / 15, check enabled), so behaviour is unchanged until modified. /api/status exposes them (target_profile, startup_check, test_unit_id, test_function, test_register, test_reg_count).

   Verified on the test proxy against the EMMA emulator.
2. mcamposv

   closed this as completedon Nov 2, 2026