I am hammering away at the development of the firmware for the micro on the SubPos Node. I currently have it talking to the ESP module via UART2 and have a user interface with UART1. Implemented as well is a setup wizard and EEPROM storage.

First boot (notice the CRC error at the start; data is stored with a CRC):

SubPos Node - http://www.subpos.org
fw ver 0.9.5 2015-06-27

error: eeprom data crc check failed, data not loaded.

error: settings data crc check failed, settings not loaded.

initialising esp module.

menu:
help - display this menu message.
wizz - guided configuration wizard.
show - show current settings.
hexd - enter pre coded hex data.
dbcn - disable beacons.
ebcn - enable beacons.
norm - set beacon mode normal.
acut - set beacon mode accurate timing.
freq - set beacon mode freq hopping (cyclic).
slat - set latitude.
slng - set longitude.
salt - set altitude.
clre - clear eeprom.
wree - write settings to eeprom.
chan - change beacon channel.

> show
device id    : 0
latitude     : 0
longitude    : 0
altitude     : 0
tx power     : 0
alt mapping  : 0
3d mapping   : 0
path loss    : 0
reserved     : 0
app id       : 0

freq hopping : 0
beacon timing: 0

> wizz
 pressing enter sets 0
 enter device id:
> 1
 enter latitude (-+ to 7 dp):
> 10
 enter longitude (-+ to 7 dp):
> 10
 enter altitude (-+ cm relative to sealevel):
> 10
 enter tx power (-+ dBm to 1 dp):
> 10
 enable offset mapping (1 or 0):
> 0
 enable 3d mapping (1 or 0):
> 0
 enter reserved data (as decimal):
> 0
 enter application id:
> 0
 enter path loss co-efficient selection:
> 0
done.

> show
device id    : 1
latitude     : 100000000
longitude    : 100000000
altitude     : 10
tx power     : 100
alt mapping  : 0
3d mapping   : 0
path loss    : 2
reserved     : 0
app id       : 0

freq hopping : 0
beacon timing: 0

> wree
 data written to eeprom.
>

Reboot device (CRC check is sucessful and data is loaded into memory):

SubPos Node - http://www.subpos.org
fw ver 0.9.5 2015-06-27

eeprom data loaded successfully.

settings loaded successfully.

initialising esp module.

menu:
help - display this menu message.
wizz - guided configuration wizard.
show - show current settings.
hexd - enter pre coded hex data.
dbcn - disable beacons.
ebcn - enable beacons.
norm - set beacon mode normal.
acut - set beacon mode accurate timing.
freq - set beacon mode freq hopping (cyclic).
slat - set latitude.
slng - set longitude.
salt - set altitude.
clre - clear eeprom.
wree - write settings to eeprom.
chan - change beacon channel.

> show
device id    : 1
latitude     : 100000000
longitude    : 100000000
altitude     : 10
tx power     : 100
alt mapping  : 0
3d mapping   : 0
path loss    : 2
reserved     : 0
app id       : 0

freq hopping : 0
beacon timing: 0

> test the thing
 command_error
>