Update NRF52 build to work again

docs/software/ant.md

@@ -0,0 +1,14 @@
+# ANT protocol notes
+
+SD340 terms are reasonable for NRF52
+https://www.thisisant.com/developer/components/nrf52832#tab_protocol_stacks_tab
+
+Profiles to implement:
+
+tracker
+https://www.thisisant.com/developer/ant-plus/device-profiles/#4365_tab
+
+ebike
+https://www.thisisant.com/developer/ant-plus/device-profiles/#527_tab
+
+no profile for messaging?

docs/software/nrf52-TODO.md

@@ -5,8 +5,11 @@
 RAM investigation.
 nRF52832-QFAA 64KB ram, 512KB flash vs
 nrf52832-QFAB 32KB ram, 512kb flash
+nrf52833 128KB RAM
 nrf52840 256KB RAM, 1MB flash
 
+Manual hacks needed to build (for now):
+
 platform.json
 
     "framework-arduinoadafruitnrf52": {
@@ -15,6 +18,8 @@ platform.json
       "version": "https://github.com/meshtastic/Adafruit_nRF52_Arduino.git"
     },
 
+kevinh@kevin-server:~/.platformio/packages/framework-arduinoadafruitnrf52/variants$ ln -s ~/development/meshtastic/meshtastic-esp32/variants/* .
+
 ## Initial work items
 
 Minimum items needed to make sure hardware is good.

docs/software/rak815.md

@@ -0,0 +1,6 @@
+# RAK815
+
+Notes on trying to get the RAK815 working with meshtastic.
+
+good tutorial: https://www.hackster.io/naresh-krish/getting-started-with-rak815-tracker-module-and-arduino-1c7bc9
+(includes software serial link - possibly useful for GPS)