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Radio Data Bridge on ESPrtk.
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When the internet connection is unavailable (the NTRIP / MQTT online service is not available), ESPrtk can use its WiFi signal to transmit GNSS data.
This is similar to the full MQTT functionality but is offline. The connections auto deployed in both protocols are TCP/UDP with the distance constrained to the WiFi transmit power.
ESPrtk will operate stably with a 2500-3000 meters baseline when using external antennas.
For LoRa link , ESPrtk 3.0.0 support communicate to external LoRa module (SX1276 , SX1277 , SX1278 , SX12769) via SPI port for km range stransmit.
Both support real-time data encryption / decryption using AES256.
| WIFI | LoRa | Unit | ||
Min | Max | Min | Max | ||
MAC /PHY | IEEE 80211 | LoRa | – | ||
Protocol | UDP/TCP-ESPrtk TM | LoRaTM – ESPrtkTM | – | ||
AES256 Encrypt | Yes | Yes |
| ||
2 ways transmit | Yes | Yes |
| ||
Channel | 1 | 14 | 1 | 14 | – |
Frequency | 2.4 Ghz | 2.5 Ghz | 412 Mhz | 915 Mhz | – |
Transmit power | 2 | 20 | 2 | 27 | dBm |
Transmit power | 1.59 | 100 | 1.59 | 500 | mW |
Speed in the air | 55 | 400 | 0.15 | 22 | Kbps |
Transmit Range | – | 3 | – | 50 | km |
Bandwidth | 20 Mhz | 40 Mhz | 56 Khz | 500 Khz | – |
Configure Radio Link using WiFi Radio.
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https://esprtk.files.wordpress.com/2020/04/esprtk-wifi-to-wifi-radio-bridge-configure.png - Copy right ESPrtk"/>Configure Radio Link using LoRa Radio.
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https://esprtk.files.wordpress.com/2020/04/esprtk-lora-to-lora-radio-bridge-configure.png - Copy right ESPrtk"/>Configure ESPrtk mode as Radio Data Bridge .
RTK Base / Rover and Data Bridge Base / Rover modes use 2 different link models and they will not work when combining them.
Data Bridge Base / Rover only supports connection via Radio Link or Bluetooth.
– When using Bluetooth, the connection between the End Devices and ESPrtk is Bluetooth, the connection between ESPrtk Base and ESPrtk Rover will be Radio WIFI (or Radio LoRa).
– When using UART , the connection between the End Devices and ESPrtk is UART, the connection between ESPrtk Base and ESPrtk Rover will be Radio WIFI (or Radio LoRa).
https://esprtk.files.wordpress.com/2020/04/esprtk-radio-bridge-mode-configure-action-planning.png - Copy right ESPrtk"/>Main Action | Detail |
UART_to_Bluetooth | Send data (from RX-UART-RTK) to (Blueooth-Client) + Export data (from Blueooth-Client) to TX-UART-RTK port |
UART_to_RF_Base | Send data (from RX-UART-RTK) to (UART_to_Radio_Rover) + Export data (from UART_to_Radio_Rover) to TX-UART-RTK port |
UART_to_RF_Rover | Send data (from RX-UART-RTK) to (UART_to_Radio_Base) + Export data (from UART_to_Radio_Base) to TX-UART-RTK port |
Bluetooth_to_RF_Base | Send data (from Blueooth-Client) to (UART_to_Radio_Rover) + Send data (from UART_to_Radio_Rover) to (Blueooth-Client) |
Bluetooth_to_RF_Rover | Send data (from Blueooth-Client) to (UART_to_Radio_Base) + Send data (from UART_to_Radio_Base) to (Blueooth-Client) |
‘Bluetooth to Radio’ mode is compatible with ‘UART to Radio’.
When configuring ESPrtk, they will be configured in pairs.
UART_to_RF_Base and UART_to_RF_Rover .
Bluetooth_to_RF_Base and Bluetooth_to_RF_Rover.
Bluetooth_to_RF_Base and UART_to_RF_Rover .
UART_to_RF_Base and Bluetooth_to_RF_Rover.
UART_to_RF_Base and UART_to_RF_Rover
https://esprtk.files.wordpress.com/2020/04/esprtk-uart_to_rf_base-vs-uart_to_rf_rover.png - Copy right ESPrtk"/>Bluetooth_to_RF_Base and Bluetooth_to_RF_Rover
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UART_to_Bluetooth | UART | Bluetooth |
UART_to_RF_Base | UART | Radio ( WiFI / LoRa) |
UART_to_RF_Rover | UART | Radio ( WiFI / LoRa) |
Bluetooth_to_RF_Base | Bluetooth | Radio ( WiFI / LoRa) |
Bluetooth_to_RF_Rover | Bluetooth | Radio ( WiFI / LoRa) |
Other Action Data Bridge | Save data send (TX-Wireless-Data) to SD Card | Save data receive (RX-Wireless-Data) to SD Card |
UART_to_Bluetooth | ● | ● |
UART_to_RF_Base | ● | ● |
UART_to_RF_Rover | ● | ● |
Bluetooth_to_RF_Base | ● | ● |
Bluetooth_to_RF_Rover | ● | ● |
Testing
There are 4 Data Bridge modes, each with 2 options for Radio type: WIFI and LoRa. The distance results may vary if you select a different LoRa module type.
We decided to choose the two most typical modes to combine: UART_to_RF_Base and Bluetooth_to_RF_Rover (Radio type is WiFi_to_WiFi).
With this option, we will have an overview of all the power and features that ESPrtk supports in a single test (UART + WIFI + Bluetooth at the same time on the ESP32 module).
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