Support older BT devices that require pin

[nseidle]

User is connecting to WinCE tablet that seems to be using an older BT stack. Luckily, the SparkFun BT dongle has the same behavior when connecting to a BT device.

We can make a pin available for older connections and no pin required for newer BT connections:

  esp_bt_io_cap_t iocap = ESP_BT_IO_CAP_NONE; //Requires pin 1234 on old BT dongle, No prompt on new BT dongle

[nseidle]

Here are binaries to try out:

• For SD loading
• For CLI loading

See this tutorial for info on how to load new firmware onto the RTK Surveyor.

[nseidle]

Fixed in v1.2.