kc868-a2 SIM7600

[krosand]

Thank you for your feedback. I have started experimenting with I2C, referencing the pins of the ESP-WROOM-32E which indicates 22 -> SCL and 21 -> SDA.

Code:

[01:04:55][C][ssd1306_i2c:010]: Setting up I2C SSD1306...
[01:04:55][E][component:113]: Component display was marked as failed.
...
[01:04:57][C][i2c.arduino:053]: I2C Bus:
[01:04:57][C][i2c.arduino:054]:   SDA Pin: 21
[01:04:57][C][i2c.arduino:055]:   SCL Pin: 22
[01:04:57][C][i2c.arduino:056]:   Frequency: 50000 Hz
[01:04:57][C][i2c.arduino:059]:   Recovery: bus successfully recovered
[01:04:57][I][i2c.arduino:069]: Results from i2c bus scan:
[01:04:57][I][i2c.arduino:071]: Found no i2c devices!
...
[01:04:57][C][ssd1306_i2c:023]: I2C SSD1306
[01:04:57][C][ssd1306_i2c:023]:   Rotations: 0°
[01:04:57][C][ssd1306_i2c:023]:   Dimensions: 128px x 64px
[01:04:57][C][ssd1306_i2c:024]:   Address: 0x3C
[01:04:57][C][ssd1306_i2c:025]:   Model: SSD1306 128x64
[01:04:57][C][ssd1306_i2c:027]:   External VCC: NO
[01:04:57][C][ssd1306_i2c:028]:   Flip X: YES
[01:04:57][C][ssd1306_i2c:029]:   Flip Y: YES
[01:04:57][C][ssd1306_i2c:030]:   Offset X: 0
[01:04:57][C][ssd1306_i2c:031]:   Offset Y: 0
[01:04:57][C][ssd1306_i2c:032]:   Inverted Color: NO
[01:04:57][C][ssd1306_i2c:033]:   Update Interval: 1.0s
[01:04:57][E][ssd1306_i2c:036]: Communication with SSD1306 failed!

As I am not confident in my configuration, could you please tell me what is incorrect?
Board KC868-A2

Code:

i2c:
  sda: 21
  scl: 22
  scan: true
  id: bus_a

font:
  - file: "gfonts://Roboto"
    id: roboto
    size: 10

display:
  - platform: ssd1306_i2c
    i2c_id: bus_a
    model: "SSD1306 128x64"
    #model: "SH1106 128x64"
    address: 0x3C
    #address: 0x3D
    lambda: |-
      it.print(0, 0, id(roboto), "Hello");

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here is our customer have made SIM7600 4G component for ESPHome: https://github.com/chino-lu/sim7600

Thank you very much, I will pass this important information on to the team and get back to you.