Using SDL_Arduino_TCA945_Test example code

SDL: Received replacement board. Thank you. Hooked it up. Having issues that I have started to work thru…
Processor: OurWeather ESP8366 board / Arduino IDE 1.8.8

Connections:
1. Grove connector from OurWeather I2C to TCA9545 J1 0x73
2. LCD display connected to TCA9545 via Grove to J4 0x3C
3. SunAirPlus connected to TCA9545 via Grove to J2 0x40 0x48
RESULT: Running TCA9545 test program shows NO devices connected

Replaced Grove connecter from OurWeather to TCA9545 with a Grove attached to OurWeather but female ends. Connected to pins on JP1 on TCA9545 GND, VCC, SDA, SCL (black, red, white, yellow)
RESULT: Running TCA9545 test program shows NO devices connected

Switched SDA & SCL lines (white and yellow) and got following output: (what I was expecting)

Bus 0 Control Register:1
Scanning...
I2C device found at address 0x40 !
I2C device found at address 0x48 !
I2C device found at address 0x73 !
done

------------------------------
Bus 1 Control Register:2
Scanning...
I2C device found at address 0x73 !
done

------------------------------
Bus 2 Control Register:4
Scanning...
I2C device found at address 0x3C !
I2C device found at address 0x73 !
done

------------------------------
Bus 3 Control Register:8
Scanning...
I2C device found at address 0x73 !
done

Added code to OURWEATHER V35 for the TCA9545 (using same code from test program):

>>>>> (before void (setup))

// TCA9545 4-Channel Mux
#include <SDL_Arduino_TCA9545.h> // DD V1.2 drivers for 4-channel MUX

SDL_Arduino_TCA9545 TCA9545;


>>>>> In void(setup)



Wire.begin();

// DD V1.5 TCA9545
TCA9545.TCA9545SetConfig();
// DD V1.5 4-channel mux

uint8_t config;
Serial.println("------------------------------");
Serial.println("------------------------------");
Serial.println("SDA_Arduino_TCA9545_Test");

Serial.println("Reading all four I2C Buses");
Serial.println("------------------------------");
Serial.println("------------------------------");
Serial.println();
// Bus 0
TCA9545.write_control_register(TCA9545_CONFIG_BUS0);

TCA9545.read_control_register(&config);
Serial.print("Bus 0 Control Register:");
Serial.println(config & 0x0F, HEX);

scan_i2c_devices_TCA9545();

delay(2000);

Serial.println("------------------------------");
// Bus 1
TCA9545.write_control_register(TCA9545_CONFIG_BUS1);

TCA9545.read_control_register(&config);
Serial.print("Bus 1 Control Register:");
Serial.println(config & 0x0F , HEX);

scan_i2c_devices_TCA9545();

delay(2000);

Serial.println("------------------------------");
// Bus 2
TCA9545.write_control_register(TCA9545_CONFIG_BUS2);

TCA9545.read_control_register(&config);
Serial.print("Bus 2 Control Register:");
Serial.println(config & 0x0F, HEX);

scan_i2c_devices_TCA9545();

delay(2000);

Serial.println("------------------------------");
// Bus 3
TCA9545.write_control_register(TCA9545_CONFIG_BUS3);

TCA9545.read_control_register(&config);
Serial.print("Bus 3 Control Register:");
Serial.println(config & 0x0F, HEX);

scan_i2c_devices_TCA9545();

// END OF DD 1.5 TCA9545 bus scan



>>>>> No TCA9545 code in LOOP section

RESULT: Got the following debug output. LCD display does NOT light up. SunAirPlus is not found.
What am I doing wrong? Why did I have to switch the SDA/SCL to get any output?
I really expected this to be a plug-n-play but maybe not?

-----------------------------
------------------------------
SDA_Arduino_TCA9545_Test
Reading all four I2C Buses
------------------------------
------------------------------

Bus 0 Control Register:F
Scanning TCA9545...
I2C device found at address 0x49 !
I2C device found at address 0x57 !
I2C device found at address 0x68 !
I2C device found at address 0x77 !
done TCA9545 loop

------------------------------
Bus 1 Control Register:F
Scanning TCA9545...
I2C device found at address 0x49 !
I2C device found at address 0x57 !
I2C device found at address 0x68 !
I2C device found at address 0x77 !
done TCA9545 loop

------------------------------
Bus 2 Control Register:F
Scanning TCA9545...
I2C device found at address 0x49 !
I2C device found at address 0x57 !
I2C device found at address 0x68 !
I2C device found at address 0x77 !
done TCA9545 loop

------------------------------
Bus 3 Control Register:F
Scanning TCA9545...
I2C device found at address 0x49 !
I2C device found at address 0x57 !
I2C device found at address 0x68 !
I2C device found at address 0x77 !
done TCA9545 loop
If I switch the SDA/SCL back around again I get the following output with OurWeather…
-----------------------------

Bus 0 Control Register:1
Scanning TCA9545...
I2C device found at address 0x40 !
I2C device found at address 0x48 !
I2C device found at address 0x49 !
I2C device found at address 0x57 !
I2C device found at address 0x68 !
I2C device found at address 0x73 !
I2C device found at address 0x77 !
done TCA9545 loop

------------------------------
Bus 1 Control Register:2
Scanning TCA9545...
I2C device found at address 0x49 !
I2C device found at address 0x57 !
I2C device found at address 0x68 !
I2C device found at address 0x73 !
I2C device found at address 0x77 !
done TCA9545 loop

------------------------------
Bus 2 Control Register:4
Scanning TCA9545...
I2C device found at address 0x3C !
I2C device found at address 0x49 !
I2C device found at address 0x57 !
I2C device found at address 0x68 !
I2C device found at address 0x73 !
I2C device found at address 0x77 !
done TCA9545 loop

------------------------------
Bus 3 Control Register:8
Scanning TCA9545...
I2C device found at address 0x49 !
I2C device found at address 0x57 !
I2C device found at address 0x68 !
I2C device found at address 0x73 !
I2C device found at address 0x77 !
done TCA9545 loop

Thanks for feedback but I do have each board connected via groove to grove connectors on mux board. What else? I guess I need clarification please

SDL: Really need your guidance on this one. Weather Station going outside today for first time for field trials...
Right now, I have a choice - I can use the BMP280 on the OurWeather Board for pressure and not monitor solar values or the other way around. When I plug SunAirPlus into the I2C bus, the BMP280 stops working.

I have the MUX board connected to OurWeather I2C via Grove (at the COMPUTER connection).
The SunAirPlus and the SunLight boards are both connected to the MUX.
But - OurWeather does not "see" them. I have to believe the wiring is correct. Just Grove connectors.
Problem must be with the software and based upon other tests (mentioned above), problem may be with an ESP8266.
Appreciate your help....