Get config from google cloud

#1
  1. My goal is: Update config from google cloud IoT
  2. My actions are: I have next code

    static void my_gcp_ev_handler(int ev, void *evd, void *arg)
    {
        if (ev == MGOS_GCP_EV_CONFIG)
        {
            LOG(LL_INFO, ("MGOS_GCP_EV_CONFIG"));
           struct mgos_gcp_config_arg *msg= (struct mgos_gcp_config_arg *) arg;
           struct mg_str *s = &msg->value;
           LOG_(LL_INFO, ("got command: [%.*s]", (int) s->len, s->p));
        (void)evd;
        (void)arg;
    }
    enum mgos_app_init_result mgos_app_init(void)
    {
    mgos_event_add_group_handler(MGOS_GCP_EV_BASE, my_gcp_ev_handler, NULL);
        return MGOS_APP_INIT_SUCCESS;
    }
  1. The result I see is: fatal error

    [May  9 16:17:02.405] mgos_mqtt_conn.c:231    MQTT0 TCP connect ok (0)
    [May  9 16:17:02.790] mgos_mqtt_conn.c:275    MQTT0 CONNACK 0
    [May  9 16:17:02.806] mgos_mqtt_conn.c:212    MQTT0 sub /devices/CO2_METER_119EB4/commands/# @ 1
    [May  9 16:17:02.806] mgos_mqtt_conn.c:212    MQTT0 sub /devices/CO2_METER_119EB4/config @ 1
    [May  9 16:17:02.886] main.c:128              MGOS_GCP_EV_CONFIG
    [May  9 16:17:02.886] 
    [May  9 16:17:02.886] Exception 28 @ 0x402a5002, vaddr 0x00000004
    [May  9 16:17:02.886]  A0: 0x402a4ffc  A1: 0x3ffffce0  A2: 0x402043d1  A3: 0x00000000
    [May  9 16:17:02.886]  A4: 0x00000000  A5: 0x00000018  A6: 0x00000001  A7: 0x00000001
    [May  9 16:17:02.902]  A8: 0x00000000  A9: 0x00000018 A10: 0x00000001 A11: 0x20202020
    [May  9 16:17:02.902] A12: 0x00000000 A13: 0x3fff20bc A14: 0x3ffffd20 A15: 0x000000ff
  1. My expectation & question is: where error in my code? Anybody have example of work with google iot config and command?
#2
struct mgos_gcp_config_arg *msg= (struct mgos_gcp_config_arg *) evd;
#3

Thank you. It is work.