# Precise time sync (ms) between multiple Photons **URL:** \ **Category:** General\ **Created:** [August 11, 2017, 5:04pm UTC](https://community.particle.io/t/precise-time-sync-ms-between-multiple-photons/35269 "2017-08-11T17:04:48Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![cermak](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/cermak/32/14174_2.png) [@cermak](https://community.particle.io/u/cermak)\ **Post date:** [August 13, 2017, 6:28pm UTC](https://community.particle.io/t/precise-time-sync-ms-between-multiple-photons/35269/2 "2017-08-13T18:28:10Z")
@lubker - I have been working on proving out the instructions for running the [local cloud](https://community.particle.io/t/tutorial-local-cloud-1st-time-instructions-01-oct-15/5589) on a Raspberry Pi 3 setting that up as an access point. I finally have it all working and can say that Photons do a time sync against the local cloud. I don’t know what sort of latency you will have between the Photon and RPi3. I am using the stock spark-server and spark-protocol. There is one small patch to perform in the spark-protocol code noted in my instructions. There is a lot of patches floating out there. At this point it is sufficient for the device to connect to the local cloud and obtain the cloud time – from the RPi3. ```auto $ particle serial monitor --follow Polling for available serial device... Opening serial monitor for com port: "/dev/cu.usbmodem1411" Serial monitor opened successfully: 0000001922 [system] INFO: ARM_WLAN_WD 2 0000001922 [hal.wlan] INFO: Bringing WiFi interface up with DHCP 0000002974 [system] INFO: CLR_WLAN_WD 1, DHCP success 0000002975 [system] INFO: Cloud: connecting 0000002976 [system] INFO: Read Server Address = type:0,domain:,ip: 10.1.0.1, port: 65535 0000005732 [system] INFO: connected to cloud 10.1.0.1:5683 0000005732 [system] INFO: Cloud socket connected 0000005732 [system] INFO: Starting handshake: presense_announce=1 0000005733 [comm.sparkprotocol.handshake] INFO: Started: Receive nonce 0000005740 [comm.sparkprotocol.handshake] INFO: Encrypting handshake nonce 0000005786 [comm.sparkprotocol.handshake] INFO: Sending encrypted nonce 0000005787 [comm.sparkprotocol.handshake] INFO: Receive key 0000005878 [comm.sparkprotocol.handshake] INFO: Setting key 0000006066 [comm.sparkprotocol.handshake] INFO: Sending HELLO message 0000006067 [comm.sparkprotocol.handshake] INFO: Receiving HELLO response 0000006078 [comm.sparkprotocol.handshake] INFO: Completed 0000006078 [system] INFO: Send spark/device/claim/code event 0000006079 [system] INFO: Send spark/hardware/max_binary event 0000006079 [system] INFO: spark/hardware/ota_chunk_size event 0000006079 [system] INFO: Send spark/device/last_reset event 0000006080 [system] INFO: Send subscriptions 0000006080 [comm.sparkprotocol] INFO: Sending TIME request 0000006082 [system] INFO: Cloud connected 0000009583 [comm.sparkprotocol] INFO: Received TIME response: 1502647946 ``` My version of the local cloud installation instructions and AP instructions can be found here: > **[jr3cermak/particle](https://github.com/jr3cermak/particle/tree/master/misc/Linux/RPi3)** > > particle - public libraries and projects --- _[View the full topic](https://community.particle.io/t/precise-time-sync-ms-between-multiple-photons/35269)._