The Iliad - Book I

[PaulZC]

Note: this PR needs the latest version of SEMP (1.0.6)

This PR:

• Attempts to minimise the "no increase in file size" and the disconnect "due to lack of RTCM" glitches during NTRIP Server
• See [Release Candidate] NTRIP Server breaking connection due to (unreal) lack of RTCM #702 for details. The real issue is network latency when using rtk2go. But there are improvements that can be made:
• RTCM data from the GNSS is stored in a new ring buffer in PSRAM
  • See Base.ino for details
• Data is written to consumers by sendRTCMToConsumers() - from inside the gnssReadTask instead of processUart1Message
• On WiFi / Ethernet / Cellular: each complete RTCM message is written in one single write
  • Previously RTCM was written a byte at a time - which slowed things down dramatically!
• Moves NTRIP_SERVER_DATA from settings.h into NtripServer.ino
• Adds more semaphore-protected methods in NTRIP_SERVER_DATA to prevent connected() checks during a write()
• Adds pin_debug for logic analyzer debugging - on EVK we can use the baseStatusLED for this
• Adds settings.networkClientWriteTimeout_ms to avoid excessive write times from the default 3000ms timeout
• Reverts the recent increase in uartReceiveBufferSize and btReadTaskStackSize
• Adds new Tools Dinger.py and NTRIP_Sink.py
  • Dinger.py examines COM data, looks for a string and generates a "Ding" when the string is found. The date, time and following data are printed too. Very handy for trapping and recording rare events
  • NTRIP_Sink.py is a very simple local NTRIP Server: when a device connects, it sends "ICY 200 OK" and then sinks all incoming data with a byte count. Very handy for testing NTRIP Server without the latency of an external Caster
• Allows individual NTRIP Servers to be Enabled / Disabled - as requested in Postal RTK: In Base mode, turn casters on or off individually. #758
• Includes a temporary workaround to prevent bluetoothStop() from crashing