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Simple Websocket/HTTPS/TLS server on raspberry pi pico.

Goal here is to have a simple build environment and libraries to create your own TLS server. A simple 'hello world' is provided as example that can handle simple HTTPS requests and WebSocket clients.

How to compile:

  1. Create certificates or insert your own.
cd pico_tls/certificate

Either RSA or EC

./create_cert_rsa.sh
./create_cert_ec.sh

This generates a self signed certificate in key.h/cert.h. Alternative is to create a 'certificate' folder with same file format anywhere else in include path.

  1. Configure wifi in example (otherwise it won't connect):
hello_world/config/wifi.h
  1. Fetch submodules
git submodule update --init --recursive
  1. Build - do one of the following based on preference

Option 1: Use a docker build image

./build_via_docker.sh

Option 2: build on a local ubuntu

Install pico dependencies

sudo apt install cmake gcc-arm-none-eabi libnewlib-arm-none-eabi xxd python3 g++ bash

Build:

./build.sh

Logs

There are two different types of logs.

  1. Application logs

These are sent over UDP. Configure a host in "config/logging_config.h"

#define LOGGING_SERVER "192.168.100.150"
#define LOGGING_SERVER_PORT 21000

and on the remote host:

netcat -ukl 21000

If it crashes you will see something like this

 11    10619 Undef 16-bit instr sr = 0x6100002e
 12    10619 R0  = 0x00000001  R8  = 0x20005b7c
 13    10619 R1  = 0x00000001  R9  = 0x2000dfe8
 14    10619 R2  = 0x2000f670  R10 = 0x000001a6
 15    10619 R3  = 0x00000000  R11 = 0x2000fe68
 16    10619 R4  = 0x2000dfd8  R12 = 0x2000fe5c
 17    10619 R5  = 0x00000000  SP  = 0x20041da0
 18    10620 R6  = 0x20019398  LR  = 0x2000fe68
 19    10620 R7  = 0x20005b7c  PC  = 0x1000064c
 20    10620  -> undef instr16: 0xdeff
 21    10620 crashed at: 0x1000064c

using gdb and addresses you can see line where issue occurs:

# gdb ./build_docker/hello_world/hello_world.elf

(gdb) info line *0x1000064c
Line 302 of "/source/hello_world/http_session.cpp" starts at address 0x10000648 <_ZN11HTTPSession7on_recvEPhj+20> and ends at 0x10000654 <_ZN11HTTPSessionD2Ev>.
  1. Other logs (lwip/etc):

You can grab those via:

while true; do minicom -b 115200 -o -D /dev/ttyACM0; done
  1. To enable logs

3.1. If you want full verbose mbedtls logs with packets, add the following

hello_world/config/mbedtls_config.h

#define MBEDTLS_DEBUG_C

3.2. If you want pico-tls/altcp mbedtls logs

hello_world/config/lwipopts.h

#define LWIP_DEBUG 1
#define ALTCP_MBEDTLS_DEBUG  LWIP_DBG_ON
#define PICO_TLS_DEBUG LWIP_DBG_ON

3.3. If you want TCP stack logs

Change any of the LWIP_DBG_OFF to LWIP_DBG_ON that you are interested in file below. Use a build that doesn't have NDEBUG defined.

hello_world/config/lwipopts_common.h