Could not wake modem for clock sync

Hi,

Continuing to run into a problem connecting our Mayfly to LTE, getting an error: “Could not wake modem for clock sync”.

I’ve seen this posted a lot but I still can’t find any concrete reasons as to why I’m getting this error. I’m using the “DRWI_SIM7080LTE” sample sketch and using a HYDROS 21 to connect.

I’ve generated, formatted, and connected all the appropriate UUIDs according to Monitormywatershed, and the serial clock monitor is saying that they’re all in a logical order. I’m also able to save data and it seems the sensor is working, it’s just giving me -9999 for connectivity to LTE and just not able to wake up the modem in general.

Some other info:

Using the SIM7080G, and the part of the sketch that corresponds is as follows:

/** Start [sim_com_sim7080] */
// For almost anything based on the SIMCom SIM7080G
#include <modems/SIMComSIM7080.h>

// Create a reference to the serial port for the modem
HardwareSerial& modemSerial = Serial1; // Use hardware serial if possible
const int32_t modemBaud = 9600; // SIM7080 does auto-bauding by default, but
// for simplicity we set to 9600

// Modem Pins – Describe the physical pin connection of your modem to your board
// NOTE: Use -1 for pins that do not apply

const int8_t modemVccPin = 18;
// MCU pin controlling modem power — Pin 18 is the power enable pin for the
// bee socket on Mayfly v1.0, use -1 if using Mayfly 0.5b or if the bee socket
// is constantly powered (ie you changed SJ18 on Mayfly 1.77u
const int8_t modemStatusPin = 19; // MCU pin used to read modem status
const int8_t modemSleepRqPin = 23; // MCU pin for modem sleep/wake request
const int8_t modemLEDPin = redLED; // MCU pin connected an LED to show modem
//

// Network connection information
const char* apn =
“hologram”; // APN connection name, typically Hologram unless you have a
// different provider’s SIM card. Change as needed

// Create the modem object
SIMComSIM7080 modem7080(&modemSerial, modemVccPin, modemStatusPin,
modemSleepRqPin, apn);
// Create an extra reference to the modem by a generic name
SIMComSIM7080 modem = modem7080;
/** End [sim_com_sim7080] */

Let me know if any other information is needed.

Thank you