Random thoughts about budgets. Nothing coherent at the moment.

AWS IoT core supports TLS 1.2: https://docs.aws.amazon.com/iot/latest/developerguide/transport-security.html

Still frustrated by the challenges of getting what should be simple to work:

• Raspberry Pi Pico W
• lwIP for TCP/IP
• mbedTLS for TLS
• coreMQTT for MQTT

It’s time to deal with mbedTLS again. This time from a different angle. Rather than use the lwIP/mbedTLS integration using application layered TCP (altcp_* functions), maybe I can use mbedTLS functions backed by lwIP sockets. We’ll see.

FreeRTOS on Raspberry Pi Pico?

After spending many hours trying to get coreMQTT to work with lwIP and BearSSL, I finally gave up. The problem was incompatible APIs. coreMQTT doesn’t really work with asynchronous functions (sending N bytes and being told that M have been sent via an asynchronous callback).

Reading the Wikipedia article about slot machines, it looks like nobody is using fixed reels that just do what they do. The machine controls the next result and shows whatever it wants to show at the time. This feels like a reasonable model.