Add Heltec Mesh Node T114 No Screen board definition

[Heltec-Aaron-Lee]

Add Heltec Mesh Node T114 No Screen board definition.

The default BlueTooth connection pin code is 123456

[lyusupov]

Aaron, what's up with Heltec T114 V1 replacement program ?

I've made a request via AliExpress on October 13th and the Heltec Sales personnel responded that the request was accepted.
Today is December 3rd, few days before completion of 2 month period, but the replacement (1 piece of T114 V2) is still NOT shipped out.

[mverch67]

IMO this PR is a bit like shooting sparrows with cannons. There is no need for another variant as it is likely that the variant could be requested at runtime. The ST7789 display driver supports SDA+DC readings of the driver ID.

I did run a slightly modified sketch adapted for heltec T114 and got the following result:

Bi-directional Read registers SDA (+ DC)
read reg(4):  ID = 0x8181B3
controller
data sheet specific calls
controller reg(0x04) = 0x8181B3
controller reg(0x09) = 0x00610000
controller reg(0x0A) = 0x08
controller reg(0x0B) = 0x00
controller reg(0x0C) = 0x06
controller reg(0x0D) = 0x00
controller reg(0x0E) = 0x00
controller reg(0x0F) = 0x00
controller reg(0xDA) = 0x81
controller reg(0xDB) = 0x81
controller reg(0xDC) = 0xB3

[Heltec-Aaron-Lee]

@mverch67

Due to the inability of the screenless version of T114 to display the Bluetooth connection pin code on the display, this update has been submitted in response to numerous user requests.

[Heltec-Aaron-Lee]

Hi @lyusupov

Very sorry about that. I just confirmed with my colleague that all reissues will be completed within this week.

And can you please resend some messages on AliExpress? My colleague will handle it today.

[thebentern]

Due to the inability of the screenless version of T114 to display the Bluetooth connection pin code on the display, this update has been submitted in response to numerous user requests.

I believe Manuel is suggesting we might be able to probe those registers and detect presence of the display or not to set the Bluetooth pin mode default config.

[Heltec-Aaron-Lee]

Haha @thebentern

Indeed verification via register is the best way, but adding a new hardware model can quickly solve many of the current user problems, and our upcoming nRF+SX1262 module can also use this model, making it convenient for more people to DIY their own Meshtastic hardware