OpenThread memory requirements

This page provides information about the layout and the amount of flash memory and RAM that is required by sample that are using the OpenThread stack. Use these values to see whether your application has enough space for running on particular platforms for different application configurations.

How to read the tables

The memory requirement tables list flash memory and RAM requirements for samples that were built using the available OpenThread pre-built libraries.

The values change depending on the sample, device type, and hardware platform. Moreover, take into account the following considerations:

• All samples were compiled using the default prj.conf file and images from OpenThread pre-built libraries.

• The MTD variant of the Thread CoAP Client for the End Device role was compiled with the overlay-mtd.conf file.

• To enable the multiprotocol support, the following options were used:

  • CONFIG_MPSL set to y (default setting for all samples)

  • CONFIG_BT_LL_SOFTDEVICE_DEFAULT set to y

  • CONFIG_BT set to y

  • CONFIG_BT_SMP set to y

  • CONFIG_BT_PERIPHERAL set to y

  • CONFIG_BT_DEVICE_NAME set to "NUS_CoAP_client"

  • CONFIG_BT_DEVICE_APPEARANCE set to 833

  • CONFIG_BT_MAX_CONN set to 1

  • CONFIG_BT_MAX_PAIRED set to 1

  • CONFIG_BT_NUS set to y

  • CONFIG_BT_SETTINGS set to y

• Values for the Thread CLI sample, which works with all OpenThread calls, are the highest possible for the OpenThread stack using the master image library configuration.

• In case the Total ROM or Total RAM value exceeds the Available ROM or Available RAM the sample in given configuration will not fit on the device.

nRF52840 DK RAM and flash memory requirements

The following table lists memory requirements for samples running on the nRF52840 DK (nrf52840dk_nrf52840) with the hardware cryptography support provided by the CC310.

Role	Sample	Library variant	Multiprotocol	ROM OpenThread stack + App [kB]	ROM Bluetooth LE stack [kB]	Persistent storage [kB]	RAM OpenThread stack + App [kB]	RAM Bluetooth LE stack [kB]	Total ROM [kB]	Avaialble ROM [kB]	Total RAM [kB]	Available RAM [kB]
Router	CLI	Master	No	448	0	32	96	0	480	1024	96	256
Router	CLI	FTD	No	429	0	32	95	0	461	1024	95	256
Router	CLI	Master	Yes	558	110	32	96	15	590	1024	111	256
Router	CLI	FTD	Yes	539	110	32	95	15	571	1024	110	256
Router	NCP	Master	No	409	0	32	95	0	441	1024	95	256
Router	NCP	FTD	No	387	0	32	92	0	419	1024	92	256
Router	NCP	Master	Yes	518	109	32	95	15	550	1024	110	256
Router	NCP	FTD	Yes	495	108	32	92	17	527	1024	109	256
Router	CoAP Server	Master	No	453	0	32	97	0	485	1024	97	256
Router	CoAP Server	FTD	No	434	0	32	96	0	466	1024	96	256
Router	CoAP Server	Master	Yes	563	110	32	97	15	595	1024	112	256
Router	CoAP Server	FTD	Yes	544	110	32	96	15	576	1024	111	256
Router	CoAP Client	Master	No	464	0	32	99	0	496	1024	99	256
Router	CoAP Client	FTD	No	445	0	32	98	0	477	1024	98	256
Router	CoAP Client	Master	Yes	589	125	32	99	19	621	1024	119	256
Router	CoAP Client	FTD	Yes	570	125	32	98	19	602	1024	117	256
End Device	CoAP Client	MTD	No	443	0	32	98	0	475	1024	98	256
End Device	CoAP Client	MTD	Yes	569	126	32	98	19	601	1024	117	256

nRF52833 DK RAM and flash memory requirements

The following table presents memory requirements for samples running on the nRF52833 DK (nrf52833dk_nrf52833) with the software cryptography support provided by the nrf_oberon crypto library module.

Role	Sample	Library variant	Multiprotocol	ROM OpenThread stack + App [kB]	ROM Bluetooth LE stack [kB]	Persistent storage [kB]	RAM OpenThread stack + App [kB]	RAM Bluetooth LE stack [kB]	Total ROM [kB]	Avaialble ROM [kB]	Total RAM [kB]	Available RAM [kB]
Router	CLI	Master	No	425	0	32	104	0	457	512	104	128
Router	CLI	FTD	No	406	0	32	103	0	438	512	103	128
Router	CLI	Master	Yes	535	110	32	104	14	567	512	118	128
Router	CLI	FTD	Yes	516	110	32	103	14	548	512	117	128
Router	NCP	Master	No	384	0	32	102	0	418	512	102	128
Router	NCP	FTD	No	363	0	32	99	0	395	512	99	128
Router	NCP	Master	Yes	495	109	32	102	15	527	512	117	128
Router	NCP	FTD	Yes	471	108	32	99	17	503	512	116	128
Router	CoAP Server	Master	No	430	0	32	104	0	462	512	104	128
Router	CoAP Server	FTD	No	411	0	32	103	0	443	512	103	128
Router	CoAP Server	Master	Yes	540	110	32	104	15	572	512	119	128
Router	CoAP Server	FTD	Yes	520	109	32	103	15	552	512	118	128
Router	CoAP Client	Master	No	442	0	32	106	0	474	512	106	128
Router	CoAP Client	FTD	No	422	0	32	105	0	454	512	105	128
Router	CoAP Client	Master	Yes	568	126	32	106	20	600	512	126	128
Router	CoAP Client	FTD	Yes	549	127	32	105	20	581	512	125	128
End Device	CoAP Client	MTD	No	421	0	32	105	0	453	512	105	128
End Device	CoAP Client	MTD	Yes	547	126	32	105	19	579	512	124	128