Here's what Stellarmate does.  It has no trouble with property: SN. (in Green below).
There are other bugs, but the focuser works anyways (in red below).


[2021-07-20T13:21:54.283 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Connecting to /dev/serial/by-id/usb-Silicon_Labs_CP2102N_USB_to_UART_Bridge_Controller_48af07c36dd6e811bc27d38447cc1306-if00-port0 @ 115200 "
[2021-07-20T13:21:54.289 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Port FD 3 "
[2021-07-20T13:21:54.290 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Connection successful, attempting handshake... "
[2021-07-20T13:21:54.291 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Sending command: {\"req\":{\"get\":{\"SN\":\"\"}}} with property: SN "
[2021-07-20T13:21:54.300 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Received response: {\"res\":{\"get\":{\"SN\":\"ESATTO20251\"}}} "
[2021-07-20T13:21:54.302 MDT INFO ][           org.kde.kstars.indi] - Esatto :  "[INFO] Serial number: ESATTO20251 "
[2021-07-20T13:21:54.405 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Sending command: {\"req\":{\"get\":{\"SWVERS\":\"\"}}} with property: SWAPP "
[2021-07-20T13:21:54.406 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Received response: {\"res\":{\"get\":{\"SWVERS\":{\"SWAPP\":\"1.3\",\"SWWEB\":\"1.3\"}}}} "
[2021-07-20T13:21:54.408 MDT INFO ][           org.kde.kstars.indi] - Esatto :  "[INFO] Firmware version: 1.3 "
[2021-07-20T13:21:54.411 MDT INFO ][           org.kde.kstars.indi] - Esatto :  "[INFO] Esatto is online. Getting focus parameters... "
[2021-07-20T13:21:54.414 MDT INFO ][           org.kde.kstars.indi] - Esatto :  "[INFO] Esatto is online. "
[2021-07-20T13:21:54.414 MDT INFO ][           org.kde.kstars.ekos] - "Esatto" Version: "0.7" Interface: 8 is connected.
[2021-07-20T13:21:54.414 MDT DEBG ][           org.kde.kstars.ekos] - 3  devices connected out of  7
[2021-07-20T13:21:54.503 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Sending command: {\"req\":{\"get\":{\"MOT1\":\"\"}}} with property: CAL_MAXPOS "
[2021-07-20T13:21:54.514 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Received response: {\"res\":{\"get\":{\"MOT1\":{\"ABS_POS\":180510,\"EL_POS\":0,\"MARK\":0,\"SPEED\":0,\"ACC\":70,\"DEC\":70,\"MAX_SPEED\":65,\"MIN_SPEED\":0,\"TVAL_HOLD\":2,\"TVAL_RUN\":18,\"TVAL_ACC\":18,\"TVAL_DEC\":18,\"T_FAST\":25,\"TON_MIN\":41,\"TOFF_MIN\":41,\"FS_SPD\":39,\"OC "
[2021-07-20T13:21:54.514 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < FOCUS_MOTION >
[2021-07-20T13:21:54.657 MDT INFO ][     org.kde.kstars.ekos.focus] - "Idle."
[2021-07-20T13:21:54.661 MDT INFO ][           org.kde.kstars.ekos] - "Esatto focuser is online."
[2021-07-20T13:21:54.666 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < REL_FOCUS_POSITION >
[2021-07-20T13:21:54.670 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < ABS_FOCUS_POSITION >
[2021-07-20T13:21:54.674 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < FOCUS_MAX >
[2021-07-20T13:21:54.677 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < FOCUS_ABORT_MOTION >
[2021-07-20T13:21:54.681 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < Presets >
[2021-07-20T13:21:54.689 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < Goto >
[2021-07-20T13:21:54.691 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < USEJOYSTICK >
[2021-07-20T13:21:54.694 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < SNOOP_JOYSTICK >
[2021-07-20T13:21:54.700 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < FOCUS_SPEED >
[2021-07-20T13:21:54.704 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < CALIBRATION_MESSAGE >
[2021-07-20T13:21:54.708 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < FOCUS_CALIBRATION >
[2021-07-20T13:21:54.712 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < FOCUS_HOME >
[2021-07-20T13:21:54.715 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < MOTOR_RATE >
[2021-07-20T13:21:54.723 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < MOTOR_CURRENT >
[2021-07-20T13:21:54.731 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < MOTOR_HOLD >
[2021-07-20T13:21:54.735 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < MOTOR_APPLY_PRESET >
[2021-07-20T13:21:54.738 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < MOTOR_APPLY_USER_PRESET >
[2021-07-20T13:21:54.741 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < MOTOR_SAVE_USER_PRESET >
[2021-07-20T13:21:54.744 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < FOCUS_FIRMWARE >
[2021-07-20T13:21:54.748 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Sending command: {\"req\":{\"get\":{\"MOT1\":\"\"}}} with property: NTC_T "
[2021-07-20T13:21:54.752 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Received response: {\"res\":{\"get\":{\"MOT1\":{\"ABS_POS\":180510,\"EL_POS\":0,\"MARK\":0,\"SPEED\":0,\"ACC\":70,\"DEC\":70,\"MAX_SPEED\":65,\"MIN_SPEED\":0,\"TVAL_HOLD\":2,\"TVAL_RUN\":18,\"TVAL_ACC\":18,\"TVAL_DEC\":18,\"T_FAST\":25,\"TON_MIN\":41,\"TOFF_MIN\":41,\"FS_SPD\":39,\"OC "
[2021-07-20T13:21:54.752 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Sending command: {\"req\":{\"get\":{\"EXT_T\":\"\"}}} with property: EXT_T "
[2021-07-20T13:21:55.293 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Received response: {\"res\":{\"get\":{\"EXT_T\":\"29.69\"}}} "
[2021-07-20T13:21:55.293 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < FOCUS_TEMPERATURE >
[2021-07-20T13:21:55.302 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Sending command: {\"req\":{\"get\":{\"VIN_12V\":\"\"}}} with property: VIN_12V "
[2021-07-20T13:21:55.344 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Received response: {\"res\":{\"get\":{\"VIN_12V\":\"13.99\"}}} "
[2021-07-20T13:21:55.344 MDT DEBG ][           org.kde.kstars.indi] - < Esatto >: < VOLTAGE_IN >
[2021-07-20T13:21:55.351 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Sending command: {\"req\":{\"get\":{\"MOT1\":\"\"}}} with property: ABS_POS "
[2021-07-20T13:21:55.443 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Received response: {\"res\":{\"get\":{\"MOT1\":{\"ABS_POS\":180510,\"EL_POS\":0,\"MARK\":0,\"SPEED\":0,\"ACC\":70,\"DEC\":70,\"MAX_SPEED\":65,\"MIN_SPEED\":0,\"TVAL_HOLD\":2,\"TVAL_RUN\":18,\"TVAL_ACC\":18,\"TVAL_DEC\":18,\"T_FAST\":25,\"TON_MIN\":41,\"TOFF_MIN\":41,\"FS_SPD\":39,\"OC "
[2021-07-20T13:21:55.443 MDT DEBG ][     org.kde.kstars.ekos.focus] - Abs Focuser position changed to  180510 State: Ok
[2021-07-20T13:21:55.594 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Received response: {\"res\":{\"get\":{\"MOT1\":{\"ABS_POS\":180510,\"EL_POS\":0,\"MARK\":0,\"SPEED\":0,\"ACC\":70,\"DEC\":70,\"MAX_SPEED\":65,\"MIN_SPEED\":0,\"TVAL_HOLD\":2,\"TVAL_RUN\":18,\"TVAL_ACC\":18,\"TVAL_DEC\":18,\"T_FAST\":25,\"TON_MIN\":41,\"TOFF_MIN\":41,\"FS_SPD\":39,\"OC "
[2021-07-20T13:21:55.596 MDT INFO ][           org.kde.kstars.indi] - Esatto :  "[ERROR] Failed to find property: FnRUN_ACC "
[2021-07-20T13:21:55.597 MDT INFO ][           org.kde.kstars.indi] - Esatto :  "[WARNING] Failed to inquire parameters. Check logs. "
[2021-07-20T13:21:55.597 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Sending command: {\"req\":{\"get\":{\"MOT1\":\"\"}}} with property: ABS_POS "
[2021-07-20T13:21:55.746 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Received response: {\"res\":{\"get\":{\"MOT1\":{\"ABS_POS\":180510,\"EL_POS\":0,\"MARK\":0,\"SPEED\":0,\"ACC\":70,\"DEC\":70,\"MAX_SPEED\":65,\"MIN_SPEED\":0,\"TVAL_HOLD\":2,\"TVAL_RUN\":18,\"TVAL_ACC\":18,\"TVAL_DEC\":18,\"T_FAST\":25,\"TON_MIN\":41,\"TOFF_MIN\":41,\"FS_SPD\":39,\"OC "
[2021-07-20T13:21:55.748 MDT INFO ][           org.kde.kstars.indi] - Esatto :  "[INFO] Loading device configuration... "
[2021-07-20T13:21:55.754 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Auto search is disabled because /dev/serial/by-id/usb-Silicon_Labs_CP2102N_USB_to_UART_Bridge_Controller_48af07c36dd6e811bc27d38447cc1306-if00-port0 is not a system port. "
[2021-07-20T13:21:55.754 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Toggle Debug Level -- Driver Debug "
[2021-07-20T13:21:55.754 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Toggle Logging Level -- Messages "
[2021-07-20T13:21:55.840 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Received response: {\"res\":{\"set\":{\"MOT1\":{\"FnRUN_ACC\":\"Error: parameter not found\",\"FnRUN_SPD\":\"Error: parameter not found\",\"FnRUN_DEC\":\"Error: parameter not found\",\"STATUS\":{\"HIZ\":1,\"UVLO\":0,\"TH_SD\":0,\"TH_WRN\":0,\"OCD\":0,\"WCMD\":0,\"NOPCMD\":0,\"BUSY "
[2021-07-20T13:21:55.842 MDT INFO ][           org.kde.kstars.indi] - Esatto :  "[INFO] Motor rates applied: Acc: 1 Run: 2 Dec: 1 "
[2021-07-20T13:21:55.912 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Received response: {\"res\":{\"set\":{\"MOT1\":{\"FnRUN_CURR_ACC\":\"Error: parameter not found\",\"FnRUN_CURR_SPD\":\"Error: parameter not found\",\"FnRUN_CURR_DEC\":\"Error: parameter not found\",\"FnRUN_CURR_HOLD\":\"Error: parameter not found\",\"STATUS\":{\"HIZ\":1,\" "
[2021-07-20T13:21:55.914 MDT INFO ][           org.kde.kstars.indi] - Esatto :  "[INFO] Motor currents applied: Acc: 7 Run: 7 Dec: 7 Hold: 3 "
[2021-07-20T13:21:55.915 MDT INFO ][           org.kde.kstars.indi] - Esatto :  "[INFO] Device configuration applied. "
[2021-07-20T13:21:55.915 MDT DEBG ][           org.kde.kstars.indi] - Esatto : "[DEBUG] Configuration successfully loaded. "

 

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