Its-g5 - Bewerkingsoverzicht

Bertrik Sikken: /* Bridge */

2026-07-30T10:47:24Z

Bridge

← Oudere versie		Versie van 30 jul 2026 10:47
Regel 81:		Regel 81:
	* Programmed the esp32-c5 with firmware		* Programmed the esp32-c5 with firmware
	* Plug an USB-C cable into the esp32-c3, programmed it with firmware, now it's powering both the esp32-c3 and the esp32-c5		* Plug an USB-C cable into the esp32-c3, programmed it with firmware, now it's powering both the esp32-c3 and the esp32-c5

	~~The esp32-c3 supermini apparently has a design flaw causing them to run very hot:~~
	* https://www.dailyduino.com/index.php/2026/01/20/the-spicy-esp32-c3-super-mini-when-2-boards-become-2-heaters/
	~~So in software you need to keep this in mind:~~
	* lower the CPU frequency, makes a few degrees difference: this seems to make SSL network connections unreliable though
	* allow some 'idle' time in Arduino, e.g. using delay(50) or delay(100) in loop()

	{\| class="wikitable" style="margin:auto"		{\| class="wikitable" style="margin:auto"
Regel 99:		Regel 93:
	\| U0TXD/GPIO11 \|\| RX/GPIO20 \|\| Data link		\| U0TXD/GPIO11 \|\| RX/GPIO20 \|\| Data link
	\|}		\|}

			The esp32-c3 supermini apparently has a design flaw causing them to run very hot:
			* https://www.dailyduino.com/index.php/2026/01/20/the-spicy-esp32-c3-super-mini-when-2-boards-become-2-heaters/
			So in software you need to keep this in mind:
			* lower the CPU frequency, makes a few degrees difference: this seems to make SSL network connections unreliable though
			* allow some 'idle' time in Arduino, e.g. using delay(50) or delay(100) in loop()

	== Software ==		== Software ==

Bertrik Sikken: /* Bridge */

2026-07-30T10:47:04Z

Bridge

← Oudere versie		Versie van 30 jul 2026 10:47
Regel 73:		Regel 73:

	=== Bridge ===		=== Bridge ===
	An ESP32-C3 is used as the bridge part.		An ESP32-C3 is used as the bridge part. I used a 'supermini'.
	I used a 'supermini' ~~but apparently they have a design flaw causing them to run very hot:~~
	* https://www.dailyduino.com/index.~~php/2026/01/20/the-spicy-esp32-c3-super-mini-when-2-boards-become-2-heaters/~~

	How to wire it up, what I did:		How to wire it up, what I did:
Regel 83:		Regel 81:
	* Programmed the esp32-c5 with firmware		* Programmed the esp32-c5 with firmware
	* Plug an USB-C cable into the esp32-c3, programmed it with firmware, now it's powering both the esp32-c3 and the esp32-c5		* Plug an USB-C cable into the esp32-c3, programmed it with firmware, now it's powering both the esp32-c3 and the esp32-c5

			The esp32-c3 supermini apparently has a design flaw causing them to run very hot:
			* https://www.dailyduino.com/index.php/2026/01/20/the-spicy-esp32-c3-super-mini-when-2-boards-become-2-heaters/
			So in software you need to keep this in mind:
			* lower the CPU frequency, makes a few degrees difference: this seems to make SSL network connections unreliable though
			* allow some 'idle' time in Arduino, e.g. using delay(50) or delay(100) in loop()

	{\| class="wikitable" style="margin:auto"		{\| class="wikitable" style="margin:auto"

Bertrik Sikken: /* Hardware */

2026-07-13T09:02:58Z

Hardware

← Oudere versie		Versie van 13 jul 2026 09:02
Regel 61:		Regel 61:

	== Hardware ==		== Hardware ==
			=== Sniffer ===
	[[File:esp32-c5-devkitc-1.jpg\|thumb\|right\|alt=esp32-c5]]		[[File:esp32-c5-devkitc-1.jpg\|thumb\|right\|alt=esp32-c5]]
	[[File:esp32-c3-supermini.jpg\|thumb\|right\|alt=esp32-c3]]		[[File:esp32-c3-supermini.jpg\|thumb\|right\|alt=esp32-c3]]
Regel 69:		Regel 70:
	* Espressif devkit-c page: https://docs.espressif.com/projects/esp-dev-kits/en/latest/esp32c5/esp32-c5-devkitc-1/user_guide.html		* Espressif devkit-c page: https://docs.espressif.com/projects/esp-dev-kits/en/latest/esp32c5/esp32-c5-devkitc-1/user_guide.html

			It has an onboard antenna. There are also other boards with an antenna connection, which allows using an external antenna. This may be better, I don't know yet.

			=== Bridge ===
	An ESP32-C3 is used as the bridge part.		An ESP32-C3 is used as the bridge part.
	I used a 'supermini' but apparently they have a design flaw causing them to run very hot:		I used a 'supermini' but apparently they have a design flaw causing them to run very hot:
	* https://www.dailyduino.com/index.php/2026/01/20/the-spicy-esp32-c3-super-mini-when-2-boards-become-2-heaters/		* https://www.dailyduino.com/index.php/2026/01/20/the-spicy-esp32-c3-super-mini-when-2-boards-become-2-heaters/

	~~It has an onboard antenna. There are also other boards with an antenna connection, which allows using an external antenna. This may be better, I don't know yet.~~

	How to wire it up, what I did:		How to wire it up, what I did:

Bertrik Sikken: /* Hardware */

2026-07-13T09:02:27Z

Hardware

← Oudere versie		Versie van 13 jul 2026 09:02
Regel 69:		Regel 69:
	* Espressif devkit-c page: https://docs.espressif.com/projects/esp-dev-kits/en/latest/esp32c5/esp32-c5-devkitc-1/user_guide.html		* Espressif devkit-c page: https://docs.espressif.com/projects/esp-dev-kits/en/latest/esp32c5/esp32-c5-devkitc-1/user_guide.html

	An ESP32-C5 is used as the bridge part.		An ESP32-C3 is used as the bridge part.
	I used a 'supermini' but apparently they have a design flaw causing them to run very hot:		I used a 'supermini' but apparently they have a design flaw causing them to run very hot:
	* https://www.dailyduino.com/index.php/2026/01/20/the-spicy-esp32-c3-super-mini-when-2-boards-become-2-heaters/		* https://www.dailyduino.com/index.php/2026/01/20/the-spicy-esp32-c3-super-mini-when-2-boards-become-2-heaters/

Bertrik Sikken: /* Hardware */

2026-07-13T09:02:14Z

Hardware

← Oudere versie		Versie van 13 jul 2026 09:02
Regel 64:		Regel 64:
	[[File:esp32-c3-supermini.jpg\|thumb\|right\|alt=esp32-c3]]		[[File:esp32-c3-supermini.jpg\|thumb\|right\|alt=esp32-c3]]

	This project uses an ESP32-C5-devkitC-1 board:		This project uses an ESP32-C5-devkitC-1 board for the sniffer part:
	* Aliexpress product page https://nl.aliexpress.com/item/1005012416463528.html		* Aliexpress product page https://nl.aliexpress.com/item/1005012416463528.html
	* Espressif schematic https://dl.espressif.com/dl/schematics/SCH_ESP32-C5-DevkitC-1_V1.1_20240621.pdf . Actually my board is not exactly like this, the USB-UART is connected to pins GPIO11 (TX) and GPIO12 (RX), not GPIO25/GPIO24.		* Espressif schematic https://dl.espressif.com/dl/schematics/SCH_ESP32-C5-DevkitC-1_V1.1_20240621.pdf . Actually my board is not exactly like this, the USB-UART is connected to pins GPIO11 (TX) and GPIO12 (RX), not GPIO25/GPIO24.
	* Espressif devkit-c page: https://docs.espressif.com/projects/esp-dev-kits/en/latest/esp32c5/esp32-c5-devkitc-1/user_guide.html		* Espressif devkit-c page: https://docs.espressif.com/projects/esp-dev-kits/en/latest/esp32c5/esp32-c5-devkitc-1/user_guide.html

			An ESP32-C5 is used as the bridge part.
			I used a 'supermini' but apparently they have a design flaw causing them to run very hot:
			* https://www.dailyduino.com/index.php/2026/01/20/the-spicy-esp32-c3-super-mini-when-2-boards-become-2-heaters/

	It has an onboard antenna. There are also other boards with an antenna connection, which allows using an external antenna. This may be better, I don't know yet.		It has an onboard antenna. There are also other boards with an antenna connection, which allows using an external antenna. This may be better, I don't know yet.

Bertrik Sikken: /* Design */

2026-07-13T08:19:12Z

Design

← Oudere versie		Versie van 13 jul 2026 08:19
Regel 37:		Regel 37:
	* Run a simple web server on the esp-c3:		* Run a simple web server on the esp-c3:
	** Configuration page with MQTT settings: protocol, host, port, user, pass		** Configuration page with MQTT settings: protocol, host, port, user, pass
	** Perhaps configure a keystore/certificate for secure mqtt (mqtts), if needed
	** Optional: show some nice stats: mqtt status, packet rate, last packet, packets per type		** Optional: show some nice stats: mqtt status, packet rate, last packet, packets per type
	** Optional: run a very basic parser for e.g. CAM messages		** Optional: run a very basic parser for e.g. CAM messages
			* Power is provided to the esp32-c3, which then distributes power as raw 5V/GND to the esp32-c5. The esp32-c5 uses its own regulator to turn it into a stable internal supply voltage.

	Practical:		Practical:
Regel 59:		Regel 59:
	* topic 'its/<node>/info' with a JSON string, like {"emac":"xx:xx:xx:xx:xx:xx","ver":"github.com/bertrik/its-g5-receiver-v0.0.1","hwv":"esp32-c5-devkit-c1"}		* topic 'its/<node>/info' with a JSON string, like {"emac":"xx:xx:xx:xx:xx:xx","ver":"github.com/bertrik/its-g5-receiver-v0.0.1","hwv":"esp32-c5-devkit-c1"}
	* topic 'its/<node>/packet' for sniffed packets (raw, not JSON encoded)		* topic 'its/<node>/packet' for sniffed packets (raw, not JSON encoded)


	== Hardware ==		== Hardware ==

Bertrik Sikken op 7 jul 2026 om 09:09

2026-07-07T09:09:13Z

@@ Regel 48: / Regel 48: @@
 * The serial link doesn't have to be very high speed, 115200 for example. We use a hardware UART on both sides of the serial link.
 * Use https://registry.platformio.org/libraries/thomasfredericks/MicroSlip for framing packets over the serial port.
 == Hardware ==
@@ Regel 96: / Regel 108: @@
 Then viewed in wireshark:
    wireshark message.pcap

Bertrik Sikken: /* Hardware */

2026-07-06T09:17:36Z

Hardware

← Oudere versie		Versie van 6 jul 2026 09:17
Regel 53:		Regel 53:
	[[File:esp32-c3-supermini.jpg\|thumb\|right\|alt=esp32-c3]]		[[File:esp32-c3-supermini.jpg\|thumb\|right\|alt=esp32-c3]]

	~~I got~~ an ESP32-C5-devkitC-1 board~~, and it worked for me~~:		This project uses an ESP32-C5-devkitC-1 board:
	* Aliexpress product page https://nl.aliexpress.com/item/1005012416463528.html		* Aliexpress product page https://nl.aliexpress.com/item/1005012416463528.html
	* Espressif schematic https://dl.espressif.com/dl/schematics/SCH_ESP32-C5-DevkitC-1_V1.1_20240621.pdf . Actually my board is not exactly like this, the USB-UART is connected to pins GPIO11 (TX) and GPIO12 (RX), not GPIO25/GPIO24.		* Espressif schematic https://dl.espressif.com/dl/schematics/SCH_ESP32-C5-DevkitC-1_V1.1_20240621.pdf . Actually my board is not exactly like this, the USB-UART is connected to pins GPIO11 (TX) and GPIO12 (RX), not GPIO25/GPIO24.

Bertrik Sikken op 5 jul 2026 om 09:13

2026-07-05T09:13:47Z

← Oudere versie		Versie van 5 jul 2026 09:13
Regel 2:		Regel 2:
	\|Name=ITS-G5		\|Name=ITS-G5
	\|Picture=its-g5.png		\|Picture=its-g5.png
	\|Omschrijving=~~Investigating~~ ITS-G5 signals		\|Omschrijving=Receiving ITS-G5 signals
	\|Status=In progress		\|Status=In progress
	\|Contact=bertrik		\|Contact=bertrik
Regel 16:		Regel 16:

	Stuff to investigate:		Stuff to investigate:
			* Crowd-sourced live map of messages received: https://opentrafficmap.org/ Their wiki: https://wiki.opentrafficmap.org
	* Source code for an ITS-G5 receiver https://github.com/pit711/v2x2map		* Source code for an ITS-G5 receiver https://github.com/pit711/v2x2map
	* Crowd-sourced live map of messages received: https://opentrafficmap.org/
	* Simplest source code for Arduino-based sniffer: https://git.devlol.org/jstsmthrgk/simple-its-g5-receiver-firmware		* Simplest source code for Arduino-based sniffer: https://git.devlol.org/jstsmthrgk/simple-its-g5-receiver-firmware
	* How to contribute to opentrafficmap: https://wiki.opentrafficmap.org

	In the Netherlands, SPAT/MAPem messages from traffic lights are not transferred over wifi-p, but over UDAP.		In the Netherlands, SPAT/MAPem messages from traffic lights are not transferred over wifi-p, but over UDAP.
Regel 30:		Regel 29:
	The design is:		The design is:
	* Use an esp32-c5 for sniffing 802.11p frames only		* Use an esp32-c5 for sniffing 802.11p frames only
	* Use an esp32-c3 ~~(as an inexpensive jellybean part)~~ for receiving sniffed frames from the esp32-c5, connect to WiFi and upload packets over MQTT		* Use an esp32-c3 for receiving sniffed frames from the esp32-c5, connect to WiFi and upload packets over MQTT
	* The interface beteween the two boards is '''serial''', this is simpler than SPI as used in other projects:		* The interface beteween the two boards is '''serial''', this is simpler than SPI as used in other projects:
	** Only three wires required: GND, +5V and serial DATA		** Only three wires required: GND, +5V and serial DATA
	** No ~~need to~~ desolder capacitors on SPI wires of the esp32-c5		** No hardware modification required (e.g. desolder capacitors on SPI wires of the esp32-c5)
	** A serial interface is more universal, e.g. can be connected to an arbitrary linux SBC, to run a python bridge for example		** A serial interface is more universal, e.g. can be connected to an arbitrary linux SBC, to run a python bridge for example
	** On the esp32-c5 use the same wires as the existing USB-UART bridge, so you can also receive packets over USB-serial		** On the esp32-c5 use the same wires as the existing USB-UART bridge, so you can also receive packets over USB-serial
	* Run a simple web server on the esp-c3:		* Run a simple web server on the esp-c3:
	** Configuration page with MQTT settings: host, port, user, pass~~, base topic~~		** Configuration page with MQTT settings: protocol, host, port, user, pass
	** Perhaps configure a keystore/certificate for secure mqtt (mqtts), if needed		** Perhaps configure a keystore/certificate for secure mqtt (mqtts), if needed
	** Optional: show some nice stats: mqtt status, packet rate, last packet, packets per type		** Optional: show some nice stats: mqtt status, packet rate, last packet, packets per type

Bertrik Sikken: /* Hardware */

2026-07-01T21:41:15Z

Hardware

← Oudere versie		Versie van 1 jul 2026 21:41
Regel 54:		Regel 54:
	[[File:esp32-c3-supermini.jpg\|thumb\|right\|alt=esp32-c3]]		[[File:esp32-c3-supermini.jpg\|thumb\|right\|alt=esp32-c3]]

	I got ~~this ESP~~-C5-devkitC-1 board, and it worked for me:		I got an ESP32-C5-devkitC-1 board, and it worked for me:
	* Aliexpress product page https://nl.aliexpress.com/item/1005012416463528.html		* Aliexpress product page https://nl.aliexpress.com/item/1005012416463528.html
	* Espressif schematic https://dl.espressif.com/dl/schematics/SCH_ESP32-C5-DevkitC-1_V1.1_20240621.pdf . Actually my board is not exactly like this, the USB-UART is connected to pins GPIO11 (TX) and GPIO12 (RX), not GPIO25/GPIO24.		* Espressif schematic https://dl.espressif.com/dl/schematics/SCH_ESP32-C5-DevkitC-1_V1.1_20240621.pdf . Actually my board is not exactly like this, the USB-UART is connected to pins GPIO11 (TX) and GPIO12 (RX), not GPIO25/GPIO24.