Introduction

Following the 1.4.0 release, the Symphony Link protocol supports over-the-air transmission of large files to end-nodes. This capability is useful to update the firmware of the host system, or the Symphony Link module itself.

The Symphony Link File Transfer Protocol (FTP) provides the ability to send files from Conductor to a Symphony Link module. The protocol supports unicast (sending a file to a single end-node) and multicast (sending a file to multiple end-nodes simultaneously).  The FTP is initialized using Conductor's ClientEdge API to send a file to any number of end-nodes.

The protocol sends a file in segments. Each segment is 107 bytes long, with the maximum number of segments in one transfer being 2400. The protocol can therefore transfer a maximum file size of 256 kB.

Symphony Link reserves port 128 exclusively for file transfer traffic.

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