A method for expediting sensor reporting in a wireless hybrid time division multiple access, TDMA, shared-medium network, the method comprising: performing (410, 610), by a wireless network host system, a TDMA channel allocation process for the wireless hybrid TDMA shared-medium network such that each sensor device of a plurality of sensor devices is assigned a different timeslot of a plurality of timeslots for data transmissions on the wireless hybrid TDMA shared-medium network; reserving (420, 620) within each timeslot of the plurality of timeslots, a grant-free transmission window, wherein any sensor device of the plurality of sensor devices is permitted to transmit data during any grant-free transmission window; measuring (440, 640), by a sensor device of the plurality of sensor devices, sensor data; determining (450, 650), by the sensor device, the sensor data is to be transmitted to the wireless network host system prior to a next assigned timeslot assigned to the sensor device; determining, by the sensor device, an amount of time until the timeslot is assigned to the sensor device; and determining (540, 660), by the sensor device, that the amount of time until the timeslot is assigned to the sensor device exceeds a defined threshold amount of time; in response to the sensor device determining the sensor data is to be transmitted and further based at least in part on determining that the amount of time until the timeslot is assigned to the sensor device exceeding the defined threshold amount of time, transmitting (460, 670), by the sensor device, a message indicative of the sensor data and an identifier of the sensor device during a grant-free transmission window of a timeslot assigned to a different sensor device of the plurality of sensor devices. performing (410, 610), by a wireless network host system, a TDMA channel allocation process for the wireless hybrid TDMA shared-medium network such that each sensor device of a plurality of sensor devices is assigned a different timeslot of a plurality of timeslots for data transmissions on the wireless hybrid TDMA shared-medium network; reserving (420, 620) within each timeslot of the plurality of timeslots, a grant-free transmission window, wherein any sensor device of the plurality of sensor devices is permitted to transmit data during any grant-free transmission window; measuring (440, 640), by a sensor device of the plurality of sensor devices, sensor data; determining (450, 650), by the sensor device, the sensor data is to be transmitted to the wireless network host system prior to a next assigned timeslot assigned to the sensor device; determining, by the sensor device, an amount of time until the timeslot is assigned to the sensor device; and determining (540, 660), by the sensor device, that the amount of time until the timeslot is assigned to the sensor device exceeds a defined threshold amount of time; in response to the sensor device determining the sensor data is to be transmitted and further based at least in part on determining that the amount of time until the timeslot is assigned to the sensor device exceeding the defined threshold amount of time, transmitting (460, 670), by the sensor device, a message indicative of the sensor data and an identifier of the sensor device during a grant-free transmission window of a timeslot assigned to a different sensor device of the plurality of sensor devices.