4 ms·

ESP32 SSH Server – Connect to Tx/Rx Pins on ESP32 UART via Remote SSH

54 points by svermigo 4y ago

ducktective 4y ago
Is it possible to run some kind of OS that can run `busybox` on ESP32?
- n4bz0r 4y ago
  Someone had managed to run Linux on ESP32 in 2021 [0][1]. But that's more of a proof-of-concept rather than a usable thing. Not much information besides that so far I think. Update: From the post [0]: someone also managed to run Ubuntu 9.04 on the board in 2020 [2]. [0] https://www.cnx-software.com/2021/07/18/linux-5-0-esp32-processor/ https://www.cnx-software.com/2021/07/18/linux-5-0-esp32-proc... [1] https://www.esp32.com/viewtopic.php?t=2681 https://www.esp32.com/viewtopic.php?t=2681 [2] https://old.reddit.com/r/esp32/comments/dtlj7n/booting_linux_on_esp32_realtime_video/ https://old.reddit.com/r/esp32/comments/dtlj7n/booting_linux...
  - mburee 4y ago
    Is that also emulating a small arm core, like the guy who got linux booting on an avr chip?
    - usrn 4y ago
      It's emulating a RISCV machine. IIRC there is an extensa port of Linux.
- 7kay 4y ago
  NuttX runs on the ESP32[1] which provides a rather featureful shell[2] as well as a file system. [1] https://nuttx.apache.org/docs/latest/platforms/xtensa/esp32/index.html https://nuttx.apache.org/docs/latest/platforms/xtensa/esp32/... [2] https://nuttx.apache.org/docs/latest/applications/nsh/index.html https://nuttx.apache.org/docs/latest/applications/nsh/index....
gigel82 4y ago
Interesting... lots of devices (industrial control, PBXs, even smart thermostats, etc.) have debug Tx/Rx pins with no authentication at all. We have very small ESP32 boards so plug those in, find a power pin (most controllers will have a 5v/3.3v with headroom enough for esp32 to work) and bam, you're in. Reminds me of the Raspberry Pi in a thermostat episode from Mr. Robot (but that needed a lot more power and was physically larger)
ipkstef 4y ago
Micropython runs on the esp32. Packs a huge punch imo
drewzero1 4y ago
Wow, this is great! I needed a device like this last week to connect remotely to an old PBX. Ended up setting up a Debian laptop and SSHing into it, then accessing the serial port using tio. I was thinking about getting some pi-adjacent device if I needed to do this long-term, but an ESP32 would be even better.
rbanffy 4y ago
Nice for all those vintage Unix boxes that never had ethernet ports, but had bunches of RS-232's... I wonder if someone already did the opposite and hung one of these tiny things on a classic Mac serial port and used it to ssh into other computers. I know there are a couple of wifi modem emulators using tiny modules like this.
GekkePrutser 4y ago
Are there any ready made boards with esp32 and this ENC28J60 ethernet controller? I've used wemos/lolin and nodemcu but never saw an Ethernet option sadly.
- jononor 4y ago
  Olimex has several excellent ones, at good prices and under open source license.
  - GekkePrutser 4y ago
    Perfect, thanks!! Just what I was looking for. The relays on the EVB version are also super handy for my purposes. And the PoE version is super cool as well despite not having those.

54 points by svermigo 4y ago

ducktective 4y ago

Is it possible to run some kind of OS that can run `busybox` on ESP32?

n4bz0r 4y ago
Someone had managed to run Linux on ESP32 in 2021 [0][1]. But that's more of a proof-of-concept rather than a usable thing. Not much information besides that so far I think. Update: From the post [0]: someone also managed to run Ubuntu 9.04 on the board in 2020 [2]. [0] https://www.cnx-software.com/2021/07/18/linux-5-0-esp32-processor/ https://www.cnx-software.com/2021/07/18/linux-5-0-esp32-proc... [1] https://www.esp32.com/viewtopic.php?t=2681 https://www.esp32.com/viewtopic.php?t=2681 [2] https://old.reddit.com/r/esp32/comments/dtlj7n/booting_linux_on_esp32_realtime_video/ https://old.reddit.com/r/esp32/comments/dtlj7n/booting_linux...
- mburee 4y ago
  Is that also emulating a small arm core, like the guy who got linux booting on an avr chip?
  - usrn 4y ago
    It's emulating a RISCV machine. IIRC there is an extensa port of Linux.
7kay 4y ago
NuttX runs on the ESP32[1] which provides a rather featureful shell[2] as well as a file system. [1] https://nuttx.apache.org/docs/latest/platforms/xtensa/esp32/index.html https://nuttx.apache.org/docs/latest/platforms/xtensa/esp32/... [2] https://nuttx.apache.org/docs/latest/applications/nsh/index.html https://nuttx.apache.org/docs/latest/applications/nsh/index....

gigel82 4y ago

Interesting... lots of devices (industrial control, PBXs, even smart thermostats, etc.) have debug Tx/Rx pins with no authentication at all. We have very small ESP32 boards so plug those in, find a power pin (most controllers will have a 5v/3.3v with headroom enough for esp32 to work) and bam, you're in. Reminds me of the Raspberry Pi in a thermostat episode from Mr. Robot (but that needed a lot more power and was physically larger)

ipkstef 4y ago

Micropython runs on the esp32. Packs a huge punch imo

drewzero1 4y ago

Wow, this is great! I needed a device like this last week to connect remotely to an old PBX. Ended up setting up a Debian laptop and SSHing into it, then accessing the serial port using tio. I was thinking about getting some pi-adjacent device if I needed to do this long-term, but an ESP32 would be even better.

rbanffy 4y ago

Nice for all those vintage Unix boxes that never had ethernet ports, but had bunches of RS-232's... I wonder if someone already did the opposite and hung one of these tiny things on a classic Mac serial port and used it to ssh into other computers. I know there are a couple of wifi modem emulators using tiny modules like this.

GekkePrutser 4y ago

Are there any ready made boards with esp32 and this ENC28J60 ethernet controller? I've used wemos/lolin and nodemcu but never saw an Ethernet option sadly.

jononor 4y ago
Olimex has several excellent ones, at good prices and under open source license.
- GekkePrutser 4y ago
  Perfect, thanks!! Just what I was looking for. The relays on the EVB version are also super handy for my purposes. And the PoE version is super cool as well despite not having those.