Add UART multiplexer and INA226 monitoring

main/uart_mux.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <stddef.h>
+
+#include "freertos/FreeRTOS.h"
+#include "esp_err.h"
+
+esp_err_t uart_mux_init(void);
+bool uart_mux_ready(void);
+size_t uart_mux_channel_count(void);
+esp_err_t uart_mux_write(size_t channel, const uint8_t *data, size_t length, TickType_t timeout);
+esp_err_t uart_mux_read(size_t channel, uint8_t *buffer, size_t buffer_size, size_t *out_length, TickType_t timeout);