Missing GattClient write operation

[pan-]

Some write operations are missing from the current implementation:

• signed write command
• write blob operations:
  • prepare write request
  • execute (commit) write request

[ciarmcom]

ARM Internal Ref: IOTSFW-1375

[andresag01]

This seems to be a problem if the user requires writing a characteristic with a value that is longer than 21 bytes. For instance, the device name characteristic value can be up to 248 bytes.

[rgrover]

i expect there would be a limit to the size of write supported by the Attribute Protocol. There are other commands to handle large writes: 'prepare write' and 'execute write'. We haven't implemented those in BLE_API yet.