GNSS and Ntrip signals both connected wireless

GPS/GNSS
1

I usually send Gnss output through the usb port to a Windows tough tablet and ntrip over Blue tooth from a cell phone to the X2. Can I do both task wireless. No usb cable.

2

Hi Greg (@navytech ),

Are you asking of you can connect to two Bluetooth devices simultaneously? Your cell phone for incoming NTRIP, and the tablet for outgoing NMEA?

Best wishes,
Paul

3

Greg (@navytech), Yes you can connect 2 different devices concurrently to a PostCard for example. I sometimes use a smartphone over BLE and an android tablet over SPP (Bluetooth Classic) at the same time for specific testing scenarios - but this isn’t a normal/typical operation for me. I can’t promise the TX2 is the same, but I would guess so since it’s also Dual Mode Bluetooth.

For normal operation however, I let the smartphone handle sending the NTRIP corrections (SW Maps as an example) and receive the NMEA Output, both over the same BLE connection from the phone. The RTK Everywhere Firmware does a great job with multiple bluetooth characteristics to handle the bidirectional data and RTCM priority.

4

I did not think I could do two Bluetooth connections to the
X2 at the same time. I am using a program called ExpertGPS (GIS software) on a window tablet. I can pair to the tablet but the program has trouble connecting the X2.

5

I see my post might have been confusing.

To clarify the 2’nd paragraph:
For normal operations, a single Bluetooth connection to a device can handle pushing the NTRIP corrections to the GNSS and also receiving the NMEA output from the GNSS. That works fine for data collector apps that have a built-in NTRIP Client. I’m assuming ExpertGPS doesn’t, hence your difficulty.

You could use the NTRIP Client that’s built into the TX2’s Firmware - if the TX2 has wifi access (phone hotspot, etc).

Are you “stuck” with using ExpertGPS ?

6

Incredible! You learn something new every day.
I just connected my Postcard to SWmaps and Landstar 8 simultaneously. It’s fantastic. SWmaps via Bluetooth LE and Landstar 8 via Bluetooth Classic.
I didn’t know that. It could be very useful.
Thanks!

7

@amlago, I even have a PostCard Rover receiving Corrections with it’s ESP-NOW radio from another Postcard, while also being connected to (2) data collectors with BLE and SPP. It’s neat because I can inject NTRIP data over BLE to compare the RTK results real-time between the PostCard Base/Rover pair and any NTRIP source. The Base PostCard is also uploading RTCM observations to RTK2Go over WiFi while also serving the local PostCard Rover on ESP-NOW.

The Rover is configured with the following Correction Priority:

  1. Bluetooth (not NTRIP, took a while to figure that out)
  2. ESP-NOW
  3. HAS/E6
  4. all the other stuff

I use an Android Tablet (SPP) to make config changes on the fly, independent of my data collector (BLE). The data collector (SW Maps) can switch between 4 different NTRIP sources and I get “almost” immediate data/results between various corrections.
It’s one heck of a stress test with all these comms being active, but very useful.

Sorry to get off topic, it probably deserved it’s own :nerd_face:

8

I started using expertGPS because it can make offline plat map, then go into the field to verify stakes locations. I tried Qgis but it has a big learning curve.

9

yes, Without any usb connection

10

@rftop
This is perfect for what you’re saying—for real-time comparisons.
Your explanations are excellent.
Regards, Angel