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107 lines
3.7 KiB
C
107 lines
3.7 KiB
C
// Copyright (c) 2020 Cesanta Software Limited
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// All rights reserved
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#include "certs.h"
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#include "mongoose.h"
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#include <zephyr/net/net_mgmt.h>
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struct mg_mgr mgr;
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static const char *s_url = "mqtts://a3nkain3cvvy7l-ats.iot.us-east-1.amazonaws.com";
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static const char *s_rx_topic = "d/rx";
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static const char *s_tx_topic = "d/tx";
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static int s_qos = 1;
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static int s_connected = 0;
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static void fn(struct mg_connection *c, int ev, void *ev_data) {
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if (ev == MG_EV_OPEN) {
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// c->is_hexdumping = 1;
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} else if (ev == MG_EV_ERROR) {
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// On error, log error message
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MG_ERROR(("%p %s", c->fd, (char *) ev_data));
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} else if (ev == MG_EV_CONNECT) {
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// Set up 2-way TLS that is required by AWS IoT
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struct mg_tls_opts opts = {.ca = (char *) s_ca, .cert = (char *) s_cert, .key = (char *) s_key};
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mg_tls_init(c, &opts);
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} else if (ev == MG_EV_MQTT_OPEN) {
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// MQTT connect is successful
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struct mg_str topic = mg_str(s_rx_topic);
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MG_INFO(("Connected to %s", s_url));
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MG_INFO(("Subscribing to %s", s_rx_topic));
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struct mg_mqtt_opts sub_opts;
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memset(&sub_opts, 0, sizeof(sub_opts));
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sub_opts.topic = topic;
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sub_opts.qos = s_qos;
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mg_mqtt_sub(c, &sub_opts);
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c->data[0] = 'X'; // Set a label that we're logged in
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} else if (ev == MG_EV_MQTT_MSG) {
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// When we receive MQTT message, print it
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struct mg_mqtt_message *mm = (struct mg_mqtt_message *) ev_data;
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MG_INFO(("Received on %.*s : %.*s", mm->topic.len, mm->topic.buf,
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mm->data.len, mm->data.buf));
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} else if (ev == MG_EV_POLL && c->data[0] == 'X') {
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static unsigned long prev_second;
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unsigned long now_second = (*(unsigned long *) ev_data) / 1000;
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if (now_second != prev_second) {
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struct mg_str topic = mg_str(s_tx_topic), data = mg_str("{\"a\":123}");
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MG_INFO(("Publishing to %s", s_tx_topic));
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struct mg_mqtt_opts pub_opts;
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memset(&pub_opts, 0, sizeof(pub_opts));
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pub_opts.topic = topic;
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pub_opts.message = data;
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pub_opts.qos = s_qos, pub_opts.retain = false;
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mg_mqtt_pub(c, &pub_opts);
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prev_second = now_second;
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}
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}
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}
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// Zephyr: Define a semaphore and network management callback to be able to wait
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// until our IP address is ready. The main function will start and block on this
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// semaphore until this event handler releases it when the network is ready
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K_SEM_DEFINE(run, 0, 1);
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static void zeh(struct net_mgmt_event_callback *cb,
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// https://docs.zephyrproject.org/latest/releases/migration-guide-4.2.html#networking
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#if ZEPHYR_VERSION_CODE < 0x40200
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uint32_t mgmt_event,
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#else
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uint64_t mgmt_event,
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#endif
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struct net_if *iface) {
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if (mgmt_event == NET_EVENT_L4_CONNECTED) k_sem_give(&run);
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}
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int main(int argc, char *argv[]) {
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// Zephyr: Register the network management callback and block on the semaphore
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struct net_mgmt_event_callback ncb;
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net_mgmt_init_event_callback(&ncb, zeh, NET_EVENT_L4_CONNECTED);
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net_mgmt_add_event_callback(&ncb);
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k_sem_take(&run, K_FOREVER);
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mg_log_set(MG_LL_DEBUG);
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mg_mgr_init(&mgr);
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// Start infinite event loop
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MG_INFO(("Mongoose version : v%s", MG_VERSION));
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uint64_t sntp_timer = 0;
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for (;;) {
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uint64_t period = mg_boot_timestamp_ms == 0 ? 1000 : 24 * 3600 * 1000;
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if (mg_timer_expired(&sntp_timer, period, mg_millis())) {
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mg_sntp_connect(&mgr, NULL, NULL, NULL);
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}
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// Connect to AWS IoT once we have a valid time (needed for mutual TLS)
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if (mg_boot_timestamp_ms > 0 && !s_connected) {
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MG_INFO(("Connecting to : [%s]", s_url));
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struct mg_mqtt_opts opts = {.clean = true};
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mg_mqtt_connect(&mgr, s_url, &opts, fn, NULL);
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s_connected = 1;
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}
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mg_mgr_poll(&mgr, 1000);
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}
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mg_mgr_free(&mgr);
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return 0;
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}
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